Document:

EX-10.3

 Exhibit 10.3 

BACKBLAZE, INC. 

2021 EQUITY INCENTIVE PLAN 

(AS ADOPTED ON OCTOBER 25, 2021, 

EFFECTIVE ON THE IPO DATE) 

(APPROVED BY THE STOCKHOLDERS ON OCTOBER 28, 2021)

 BACKBLAZE, INC. 

2021 EQUITY INCENTIVE PLAN 

ARTICLE 1. INTRODUCTION. 

The Board adopted the Plan to become effective on the IPO Date. The purpose of the Plan is to promote the long-term success of the Company and
the creation of stockholder value by: (a) encouraging Service Providers to focus on critical long-range corporate objectives, (b) encouraging the attraction and retention of Service Providers with exceptional qualifications and
(c) linking Service Providers directly to stockholder interests through increased stock ownership. The Plan seeks to achieve this purpose by providing for Awards in the form of Options (which may be ISOs or NSOs), SARs, Restricted Shares and
Restricted Stock Units. Capitalized terms used in this Plan are defined in Article 14. 
 ARTICLE 2. ADMINISTRATION. 

2.1 General. The Plan may be administered by the Board or one or more Committees to which the Board (or an authorized Board committee)
has delegated authority. If administration is delegated to a Committee, the Committee shall have the powers theretofore possessed by the Board, including, to the extent permitted by applicable law, the power to delegate to a subcommittee any of the
administrative powers the Committee is authorized to exercise (and references in this Plan to either the Board or the Administrator shall hereafter also encompass the Committee or subcommittee, as applicable). The Board may abolish the
Committee’s delegation at any time and the Board shall at all times also retain the authority it has delegated to the Committee. The Administrator shall comply with rules and regulations applicable to it, including under the rules of any
exchange on which the Common Shares are traded, and shall have the authority and be responsible for such functions as have been assigned to it. 

2.2 Section 16. To the extent desirable to qualify transactions hereunder as exempt under Exchange Act Rule 16b-3, the transactions contemplated hereunder will be approved by the entire Board or a Committee of two or more “non-employee directors” within the meaning of
Exchange Act Rule 16b-3. 
 2.3 Powers of Administrator. Subject to the terms of the
Plan, and in the case of a Committee, subject to the specific duties delegated to the Committee, the Administrator shall have the authority to (a) select the Service Providers who are to receive Awards under the Plan, (b) determine the
type, number, vesting requirements and other features and conditions of such Awards, (c) interpret the Plan and Awards granted under the Plan, (d) make, amend and rescind rules relating to the Plan and Awards granted under the Plan,
including rules relating to sub-plans established for the purposes of satisfying applicable foreign laws or for qualifying for favorable tax treatment under applicable foreign laws, (e) impose such
restrictions, conditions or limitations as it determines appropriate as to the timing and manner of any resales by a Participant of any Common Shares issued pursuant to an Award, including restrictions under an insider trading policy and
restrictions as to the use of a specified brokerage firm for such resales, (f) determine whether, when, and to what extend an Award has become vested and/or exercisable and whether any performance-based vesting conditions have been satisfied,
and (g) make all other decisions relating to the operation of the Plan and Awards granted under the Plan. In addition, with regard to the 

 
terms and conditions of Awards granted to Service Providers outside of the United States or not subject to taxation under the laws of the United States, the Administrator may vary from the
provisions of the Plan to the extent it determines it necessary and appropriate to do so, including, where applicable, varying from the requirements set forth in Articles 5.3 and 6.3. 

2.4 Effect of Administrator’s Decisions. The Administrator’s decisions, determinations and interpretations shall be
final and binding on all interested parties. 
 2.5 Governing Law. The Plan shall be governed by, and construed in accordance
with, the laws of the State of Delaware (except its choice-of-law provisions). 

ARTICLE 3. SHARES AVAILABLE FOR GRANTS. 

3.1 Basic Limitation. Common Shares issued pursuant to the Plan may be authorized but unissued shares or treasury shares. The
aggregate number of Common Shares issued under the Plan shall not exceed the sum of (a) 5,262,500 Common Shares, plus (b) up to 13,719,000 Common Shares subject to awards granted under the Predecessor Plan that are outstanding on the IPO Date
and that subsequently are forfeited, expire or lapse unexercised or unsettled and Common Shares issued pursuant to awards granted under the Predecessor Plan that are outstanding on the IPO Date and that are subsequently forfeited to or reacquired by
the Company, and (c) the additional Common Shares described in Articles 3.2 and 3.3. The number of Common Shares that are subject to Awards outstanding at any time under the Plan may not exceed the number of Common Shares that then remain
available for issuance under the Plan. The numerical limitations in this Article 3.1 shall be subject to adjustment pursuant to Article 9. 

3.2 Annual Increase in Shares. On the first day of each fiscal year of the
Company during the term of the Plan, commencing on January 1, 2022 and ending on (and including) January 1, 2031, the aggregate number of Common Shares that may be issued under the Plan shall automatically increase by a number equal to the
least of (a) 5% of the total number of Common Shares actually issued and outstanding on the last day of the preceding fiscal year, (b) 4,784,100 Common Shares (subject to adjustment pursuant to Article 9), or (c) a lesser number of Common
Shares (including zero) determined by the Board. 
 3.3 Shares Returned to Reserve. To the extent that Options, SARs,
Restricted Stock Units or other Awards are forfeited, cancelled or expire for any reason before being exercised or settled in full, the Common Shares subject to such Awards shall again become available for issuance under the Plan. If SARs are
exercised or Restricted Stock Units are settled, then only the number of Common Shares (if any) actually issued to the Participant upon exercise of such SARs or settlement of such Restricted Stock Units, as applicable, shall reduce the number of
Common Shares available under Article 3.1 and the balance shall again become available for issuance under the Plan. If Restricted Shares or Common Shares issued upon the exercise of Options are reacquired by the Company pursuant to a forfeiture
provision, repurchase right or for any other reason, then such Common Shares shall again become available for issuance under the Plan. Common Shares applied to pay the Exercise Price of Options or to satisfy tax withholding obligations related to
any Award shall again become available for issuance under the Plan. To the extent that an Award is settled in cash rather than Common Shares, the cash settlement shall not reduce the number of Shares available for issuance under the Plan. 

 3.4 Awards Not Reducing Share Reserve. To the extent permitted under
applicable exchange listing standards, any dividend equivalents paid or credited under the Plan with respect to Restricted Stock Units shall not be applied against the number of Common Shares that may be issued under the Plan, whether or not such
dividend equivalents are converted into Restricted Stock Units. In addition, Common Shares subject to Substitute Awards granted by the Company shall not reduce the number of Common Shares that may be issued under Article 3.1, nor shall shares
subject to Substitute Awards again be available for Awards under the Plan in the event of any forfeiture, expiration or cash settlement of such Substitute Awards. 

3.5 Code Section 422 and Other Limits. Subject to adjustment in accordance with Article 9: 

(a) The aggregate grant date fair value of Awards granted to an Outside Director during any one fiscal year of the Company may not exceed
$1,000,000 (on a per-Director basis); provided however that the limitation that will apply in the fiscal year in which the Outside Director is initially appointed or elected to the Board shall instead
be $2,000,000. For purposes of this limitation, grant date fair value of an Award shall be determined in accordance with the assumptions that the Company uses to estimate the value of share-based payments for financial reporting purposes. For the
sake of clarity, neither (i) Awards granted, nor compensation paid, to an individual for their service while they were an Employee or Consultant, but not as an Outside Director, nor (ii) Awards granted pursuant to an Outside
Director’s election to receive Awards in lieu of cash retainers or other fees shall count towards this limitation. 
 (b) No more than
66,822,210 Common Shares (subject to adjustment pursuant to Article 9) may be issued under the Plan upon the exercise of ISOs. 
 ARTICLE 4.
ELIGIBILITY. 
 4.1 Incentive Stock Options. Only Employees who are
common-law employees of the Company, a Parent or a Subsidiary shall be eligible for the grant of ISOs. In addition, an Employee who owns more than 10% of the total combined voting power of all classes of
outstanding stock of the Company or any of its Parents or Subsidiaries shall not be eligible for the grant of an ISO unless the additional requirements set forth in Code Section 422(c)(5) are satisfied. 

4.2 Other Awards. Awards other than ISOs may be granted to both Employees and other Service Providers. 

ARTICLE 5. OPTIONS. 
 5.1 Stock
Option Agreement. Each grant of an Option under the Plan shall be evidenced by a Stock Option Agreement between the Optionee and the Company. Such Option shall be subject to all applicable terms of the Plan and may be subject to any other terms
that are not inconsistent with the Plan. The Stock Option Agreement shall specify whether the Option is intended to be an ISO or an NSO. The provisions of the various Stock Option Agreements entered into under the Plan need not be identical. 

5.2 Number of Shares. Each Stock Option Agreement shall specify the number of Common Shares subject to the Option, which number
shall adjust in accordance with Article 9. 

 5.3 Exercise Price. Each Stock Option Agreement shall specify the Exercise
Price, which shall not be less than 100% of the Fair Market Value of a Common Share on the date of grant. The preceding sentence shall not apply to an Option that is a Substitute Award granted in a manner that would satisfy the requirements of Code
Section 409A and, if applicable, Code Section 424(a). 
 5.4 Exercisability and Term. Each Stock Option Agreement
shall specify the date or event when all or any installment of the Option is to become vested and/or exercisable. The vesting and exercisability conditions applicable to the Option may include service-based conditions, performance-based conditions,
such other conditions as the Administrator may determine, or any combination of such conditions. The Stock Option Agreement shall also specify the term of the Option; provided that, except to the extent necessary to comply with applicable foreign
law, the term of an Option shall in no event exceed 10 years from the date of grant. A Stock Option Agreement may provide for accelerated vesting and/or exercisability upon certain specified events and may provide for expiration prior to the
end of its term in the event of the termination of the Optionee’s service. 
 5.5 Death of Optionee. After an
Optionee’s death, any vested and exercisable Options held by such Optionee may be exercised by their beneficiary or beneficiaries, their estate or legal heirs, as applicable. If permitted by the Administrator and valid under applicable law,
each Optionee may designate one or more beneficiaries for this purpose by filing the prescribed form with the Company. A beneficiary designation may be changed by filing the prescribed form with the Company at any time before the Optionee’s
death. If no beneficiary was designated or permitted, if the designation is not valid under applicable law, or if no designated beneficiary survives the Optionee, then any vested and exercisable Options held by the Optionee may be exercised by their
estate. 
 5.6 Modification or Assumption of Options. Within the limitations of the Plan, the Administrator may modify,
reprice, extend or assume outstanding options or may accept the cancellation of outstanding options (whether granted by the Company or by another issuer) in return for the grant of new Options for the same or a different number of shares and at the
same or a different exercise price or in return for the grant of a different type of Award. The foregoing notwithstanding, no modification of an Option shall, without the consent of the Optionee, materially impair their rights or obligations under
such Option. 
 5.7 Buyout Provisions. The Administrator may at any time (a) offer to buy out for a payment in cash or
cash equivalents an Option previously granted or (b) authorize an Optionee to elect to cash out an Option previously granted, in either case at such time and based upon such terms and conditions as the Administrator shall establish. 

5.8 Payment for Option Shares. The entire Exercise Price of Common Shares issued upon exercise of Options shall be payable in
cash or cash equivalents at the time when such Common Shares are purchased. In addition, the Administrator may, in its sole discretion and to the extent permitted by applicable law, accept payment of all or a portion of the Exercise Price through
any one or a combination of the following forms or methods: 
 (a) Subject to any conditions or limitations established by the Administrator,
by surrendering, or attesting to the ownership of, Common Shares that are already owned by the Optionee with a value on the date of surrender equal to the aggregate exercise price of the Common Shares as to which such Option will be exercised; 

 (b) By delivering (on a form prescribed by the Company) an irrevocable direction to a
securities broker approved by the Company to sell all or part of the Common Shares being purchased under the Plan and to deliver all or part of the sales proceeds to the Company; 

(c) Subject to such conditions and requirements as the Administrator may impose from time to time, through a net exercise or other cashless
exercise procedure; or 
 (d) Through any other form or method consistent with applicable laws, regulations and rules. 

ARTICLE 6. STOCK APPRECIATION RIGHTS. 

6.1 SAR Agreement. Each grant of a SAR under the Plan shall be evidenced by a SAR Agreement between the Optionee and the Company.
Such SAR shall be subject to all applicable terms of the Plan and may be subject to any other terms that are not inconsistent with the Plan. The provisions of the various SAR Agreements entered into under the Plan need not be identical. 

6.2 Number of Shares. Each SAR Agreement shall specify the number of Common Shares to which the SAR pertains, which number shall
adjust in accordance with Article 9. 
 6.3 Exercise Price. Each SAR Agreement shall specify the Exercise Price, which
shall in no event be less than 100% of the Fair Market Value of a Common Share on the date of grant. The preceding sentence shall not apply to a SAR that is a Substitute Award granted in a manner that would satisfy the requirements of Code
Section 409A. 
 6.4 Exercisability and Term. Each SAR Agreement shall specify the date when all or any installment of
the SAR is to become vested and exercisable. The vesting and exercisability conditions applicable to the SAR may include service-based conditions, performance-based conditions, such other conditions as the Administrator may determine, or any
combination thereof. The SAR Agreement shall also specify the term of the SAR; provided that except to the extent necessary to comply with applicable foreign law, the term of a SAR shall not exceed 10 years from the date of grant. A SAR Agreement
may provide for accelerated vesting and exercisability upon certain specified events and may provide for expiration prior to the end of its term in the event of the termination of the Optionee’s service. 

6.5 Exercise of SARs. Upon exercise of a SAR, the Optionee (or any person having the right to exercise the SAR after their
death) shall receive from the Company (a) Common Shares, (b) cash or (c) a combination of Common Shares and cash, as the Administrator shall determine. The amount of cash and/or the Fair Market Value of Common Shares received upon
exercise of SARs shall, in the aggregate, not exceed the amount by which the Fair Market Value (on the date of surrender) of the Common Shares subject to the SARs exceeds the Exercise Price. If, on the date when a SAR expires, the Exercise Price is
less than the Fair Market Value on such date but any portion of such SAR has not been exercised or surrendered, then such SAR shall automatically be deemed to be exercised as of such date with respect to such portion. A SAR Agreement may also
provide for an automatic exercise of the SAR on an earlier date. 

 6.6 Death of Optionee. After an Optionee’s death, any vested and
exercisable SARs held by such Optionee may be exercised by their beneficiary or beneficiaries or their estate or legal heirs, as applicable. If permitted by the Administrator and valid under applicable law, each Optionee may designate one or more
beneficiaries for this purpose by filing the prescribed form with the Company. A beneficiary designation may be changed by filing the prescribed form with the Company at any time before the Optionee’s death. If no beneficiary was permitted or
designated, if the designation is not valid under applicable law, or if no designated beneficiary survives the Optionee, then any vested and exercisable SARs held by the Optionee at the time of their death may be exercised by their estate or legal
heirs. 
 6.7 Modification or Assumption of SARs. Within the limitations of the Plan, the Administrator may modify, reprice,
extend or assume outstanding SARs or may accept the cancellation of outstanding SARs (whether granted by the Company or by another issuer) in return for the grant of new SARs for the same or a different number of shares and at the same or a
different exercise price or in return for the grant of a different type of Award. The foregoing notwithstanding, no modification of a SAR shall, without the consent of the Optionee, materially impair their rights or obligations under such SAR. 

ARTICLE 7. RESTRICTED SHARES. 

7.1 Restricted Stock Agreement. Each grant of Restricted Shares under the Plan shall be evidenced by a Restricted Stock Agreement
between the recipient and the Company. Such Restricted Shares shall be subject to all applicable terms of the Plan and may be subject to any other terms that are not inconsistent with the Plan. The provisions of the various Restricted Stock
Agreements entered into under the Plan need not be identical. 
 7.2 Payment for Awards. Restricted Shares may be sold or
awarded under the Plan for such consideration as the Administrator may determine, including (without limitation) cash, cash equivalents, property, cancellation of other equity awards, promissory notes, past services and future services, and such
other methods of payment as are permitted by applicable law. 
 7.3 Vesting Conditions. Each Award of Restricted Shares may or
may not be subject to vesting and/or other conditions as the Administrator may determine. Vesting shall occur, in full or in installments, upon satisfaction of the conditions specified in the Restricted Stock Agreement. Vesting conditions may
include service-based conditions, performance-based conditions, such other conditions as the Administrator may determine, or any combination thereof. A Restricted Stock Agreement may provide for accelerated vesting upon certain specified events.

 7.4 Voting and Dividend Rights. The holders of Restricted Shares awarded under the Plan shall have the same voting,
dividend and other rights as the Company’s other stockholders, unless the Administrator otherwise provides. A Restricted Stock Agreement, however, may require that any cash dividends paid on Restricted Shares (a) be accumulated and paid
when such Restricted Shares vest, or (b) be invested in additional Restricted Shares. Such additional Restricted Shares shall be subject to the same conditions and restrictions as the shares subject to the Award with respect to which the
dividends were paid. In addition, unless the Administrator provides otherwise, if any dividends or other distributions are paid in Common Shares, such Common Shares shall be subject to the same restrictions on transferability and forfeitability as
the Restricted Shares with respect to which they were paid. 

 7.5 Modification or Assumption of Restricted Shares. Within the limitations of
the Plan, the Administrator may modify or assume outstanding Restricted Shares or may accept the cancellation of outstanding restricted shares (whether granted by the Company or by another issuer) in return for the grant of new Restricted Shares for
the same or a different number of shares or in return for the grant of a different type of Award. The foregoing notwithstanding, no modification of Restricted Shares shall, without the consent of the Participant, materially impair their rights or
obligations under such Restricted Shares. 
 ARTICLE 8. RESTRICTED STOCK UNITS. 

8.1 Restricted Stock Unit Agreement. Each grant of Restricted Stock Units under the Plan shall be evidenced by a
Restricted Stock Unit Agreement between the recipient and the Company. Such Restricted Stock Units shall be subject to all applicable terms of the Plan and may be subject to any other terms that are not inconsistent with the Plan. The provisions of
the various Restricted Stock Unit Agreements entered into under the Plan need not be identical. 
 8.2 Payment for Awards. To
the extent that an Award is granted in the form of Restricted Stock Units, no cash consideration shall be required of the Award recipients. 

8.3 Vesting Conditions. Each Award of Restricted Stock Units may or may not be subject to vesting, as determined by the
Administrator. Vesting shall occur, in full or in installments, upon satisfaction of the conditions specified in the Restricted Stock Unit Agreement. Vesting conditions may include service-based conditions, performance-based conditions, such other
conditions as the Administrator may determine, or any combination thereof. A Restricted Stock Unit Agreement may provide for accelerated vesting upon certain specified events. 

8.4 Voting and Dividend Rights. The holders of Restricted Stock Units shall have no voting rights. Prior to settlement or
forfeiture, Restricted Stock Units awarded under the Plan may, at the Administrator’s discretion, provide for a right to dividend equivalents. Such right entitles the holder to be credited with an amount equal to all cash dividends paid on one
Common Share while the Restricted Stock Unit is outstanding. Dividend equivalents may be converted into additional Restricted Stock Units. Settlement of dividend equivalents may be made in the form of cash, in the form of Common Shares, or in a
combination of both. Prior to distribution, any dividend equivalents shall be subject to the same conditions and restrictions as the Restricted Stock Units to which they attach. 

8.5 Form and Time of Settlement of Restricted Stock Units. Settlement of vested Restricted Stock Units may be made in the
form of (a) cash, (b) Common Shares or (c) any combination of both, as determined by the Administrator. The actual number of Restricted Stock Units eligible for settlement may be larger or smaller than the number included in the
original Award, based on predetermined performance factors. Methods of converting Restricted Stock Units into cash may include (without limitation) a method based on the average value of Common Shares over a series of trading days. Vested Restricted
Stock Units shall be settled in such manner and at such time(s) as specified in the Restricted Stock Unit Agreement. Until an Award of Restricted Stock Units is settled, the number of such Restricted Stock Units shall be subject to adjustment
pursuant to Article 9. 

 8.6 Death of Recipient. Any Restricted Stock Units that become payable after
the recipient’s death shall be distributed to the recipient’s beneficiary or beneficiaries or their estate or legal heirs. If permitted by the Administrator and valid under applicable law, each recipient of Restricted Stock Units under the
Plan may designate one or more beneficiaries for this purpose by filing the prescribed form with the Company. A beneficiary designation may be changed by filing the prescribed form with the Company at any time before the Award recipient’s
death. If no beneficiary was designated or permitted, if the designation is not valid under applicable law, or if no designated beneficiary survives the Award recipient, then any Restricted Stock Units that become payable after the recipient’s
death shall be distributed to the recipient’s estate or legal heirs. 
 8.7 Modification or Assumption of Restricted
Stock Units. Within the limitations of the Plan, the Administrator may modify or assume outstanding restricted stock units or may accept the cancellation of outstanding restricted stock units (whether granted by the Company or by another
issuer) in return for the grant of new Restricted Stock Units for the same or a different number of shares or in return for the grant of a different type of Award. The foregoing notwithstanding, no modification of a Restricted Stock Unit shall,
without the consent of the Participant, materially impair their rights or obligations under such Restricted Stock Unit. 
 8.8
Creditors’ Rights. A holder of Restricted Stock Units shall have no rights other than those of a general creditor of the Company. Restricted Stock Units represent an unfunded and unsecured obligation of the Company, subject
to the terms and conditions of the applicable Restricted Stock Unit Agreement. 
 ARTICLE 9. ADJUSTMENTS; DISSOLUTIONS AND LIQUIDATIONS;
CORPORATE TRANSACTIONS. 
 9.1 Adjustments. In the event of a subdivision of the outstanding Common Shares, a declaration
of a dividend payable in Common Shares, a combination or consolidation of the outstanding Common Shares (by reclassification or otherwise) into a lesser number of Common Shares or any other increase or decrease in the number of issued Common Shares
effected without receipt of consideration by the Company, proportionate adjustments shall be made to the following: 
 (a) The number and
kind of shares available for issuance under Article 3, including the numerical share limits in Articles 3.1, 3.2 and 3.5; 
 (b) The
number and kind of shares covered by each outstanding Option, SAR and Restricted Stock Unit; and/or 
 (c) The Exercise Price applicable to
each outstanding Option and SAR, and the repurchase price, if any, applicable to Award shares. 
 In the event of a declaration of an extraordinary dividend
payable in a form other than Common Shares in an amount that has a material effect on the price of Common Shares, a recapitalization, a spin-off or a similar occurrence, the Administrator may make such
adjustments as it, in its sole discretion, deems appropriate to the foregoing. Any adjustment in the number of shares subject to an Award under this Article 9.1 shall be rounded down to the nearest whole share, although the Administrator in its sole
discretion may make a cash payment in lieu of a fractional share. Except as provided in this Article 9, a Participant shall have no rights by reason of any issuance by the Company of stock of any class or securities convertible into stock of
any class, any subdivision or consolidation of shares of stock of any class, the payment of any stock dividend or any other increase or decrease in the number of shares of stock of any class. 

 9.2 Dissolution or Liquidation. To the extent not previously exercised or
settled, Options, SARs and Restricted Stock Units shall terminate immediately prior to the dissolution or liquidation of the Company. 

9.3 Corporate Transactions. In the event that the Company is a party to a merger, consolidation, or a Change in Control (other
than one described in Article 14.6(d)), all Common Shares acquired under the Plan and all Awards outstanding on the effective date of the transaction shall be treated in the manner described in the definitive transaction agreement (or, in the event
the transaction does not entail a definitive agreement to which the Company is party, in the manner determined by the Administrator, with such determination having final and binding effect on all parties), which agreement or determination need not
treat all Awards (or portions thereof) in an identical manner. Unless an Award Agreement provides otherwise, the treatment specified in the transaction agreement or by the Administrator may include (without limitation) one or more of the following
with respect to each outstanding Award: 
 (a) The continuation of such outstanding Award by the Company (if the Company is
the surviving entity); 
 (b) The assumption of such outstanding Award by the surviving entity or its parent, provided that
the assumption of an Option or a SAR shall comply with applicable tax and regulatory requirements; 
 (c) The substitution by
the surviving entity or its parent of an equivalent award for such outstanding Award (including, but not limited to, an award to acquire the same consideration paid to the holders of Common Shares in the transaction), provided that the substitution
of an Option or a SAR shall comply with applicable tax and regulatory requirements; 
 (d) In the case of an Option or SAR,
the cancellation of such Award without payment of any consideration. An Optionee shall be able to exercise their outstanding Option or SAR, to the extent such Option or SAR is then vested or becomes vested as of the effective time of the
transaction, during a period of not less than five full business days preceding the closing date of the transaction, unless (i) a shorter period is required to permit a timely closing of the transaction and (ii) such shorter period still
offers the Optionee a reasonable opportunity to exercise such Option or SAR. Any exercise of such Option or SAR during such period may be contingent on the closing of the transaction; 

(e) The cancellation of such Award and a payment to the Participant with respect to each share subject to the portion of the
Award that is vested or becomes vested as of the effective time of the transaction equal to the excess of (A) the value, as determined by the Administrator in its absolute discretion, of the property (including cash) received by the holder
of a Common Share as a result of the transaction, over (if applicable) (B) the per-share Exercise Price of such Award (such excess, if any, the “Spread”). Such payment shall be made in the form of cash, cash equivalents,
or securities of the surviving entity or its parent having a 

 
value equal to the Spread. In addition, any escrow, holdback, earn-out or similar provisions in the transaction agreement may apply to such payment to
the same extent and in the same manner as such provisions apply to the holders of Common Shares. If the Spread applicable to an Award (whether or not vested) is zero or a negative number, then the Award may be cancelled without making
a payment to the Participant. In the event that an Award is subject to Code Section 409A, the payment described in this clause (e) shall be made on the settlement date specified in the applicable Award Agreement, provided that settlement
may be accelerated in accordance with Treasury Regulation Section 1.409A-3(j)(4); or 

(f) The assignment of any reacquisition or repurchase rights held by the Company in respect of an Award of Restricted Shares to
the surviving entity or its parent, with corresponding proportionate adjustments made to the price per share to be paid upon exercise of any such reacquisition or repurchase rights. 

Unless an Award Agreement provides otherwise, each outstanding Award held by a Participant who remains a Service Provider as of the effective time of a
merger, consolidation or Change in Control (other than one described in Article 14.7(d)) (a “Current Participant”) shall become fully vested and, if applicable, exercisable immediately prior to the effective time of the transaction
and, in the case of an Award subject to performance-based vesting conditions, such performance-based vesting conditions shall be deemed achieved at 100% of target levels. However, the prior sentence shall not apply, and an outstanding Award
shall not become vested and, if applicable, exercisable, if and to the extent the Award is continued, assumed or substituted as provided for in clauses (a), (b) or (c) above. In addition, the prior two sentences shall not apply to
an Award held by a Participant who is not a Current Participant, unless an Award Agreement provides otherwise or unless the Company and the acquirer agree otherwise. 

For avoidance of doubt, the Administrator shall have the discretion, exercisable either at the time an Award is granted or at any time while the Award remains
outstanding, to provide for the acceleration of vesting upon the occurrence of a Change in Control, whether or not the Award is to be assumed or replaced in the transaction, or in connection with a termination of the Participant’s service
following a transaction. 
 Any action taken under this Article 9.3 shall either preserve an Award’s status as exempt from Code Section 409A or
comply with Code Section 409A. 
 ARTICLE 10. OTHER AWARDS. 

Subject in all events to the limitations under Article 3 above as to the number of Common Shares available for issuance under this Plan, the
Company may grant other forms of Awards not specifically described herein and may grant awards under other plans or programs, where such awards are settled in the form of Common Shares issued under this Plan. Such Common Shares shall be treated for
all purposes under the Plan like Common Shares issued in settlement of Restricted Stock Units and shall, when issued, reduce the number of Common Shares available under Article 3. 

 ARTICLE 11. LIMITATION ON RIGHTS. 

11.1 Retention Rights. Neither the Plan nor any Award granted under the Plan shall be deemed to give any individual a right to
remain a Service Provider. The Company and its Parents, Subsidiaries, and Affiliates reserve the right to terminate the service of any Service Provider at any time, with or without cause, and with or without notice, subject to applicable laws, the
Company’s certificate of incorporation and by-laws and a written employment agreement (if any). 

11.2 Stockholders’ Rights. Except as set forth in Article 7.4 or 8.4 above, a Participant shall have no
dividend rights, voting rights or other rights as a stockholder with respect to any Common Shares covered by their Award prior to the time when a stock certificate for such Common Shares is issued or, if applicable, the time when they become
entitled to receive such Common Shares by filing any required notice of exercise and paying any required Exercise Price. No adjustment shall be made for cash dividends or other rights for which the record date is prior to such time, except as
expressly provided in the Plan. 
 11.3 Regulatory Requirements. Any other provision of the Plan notwithstanding, the
obligation of the Company to issue Common Shares under the Plan shall be subject to all applicable laws, rules and regulations and such approval by any regulatory body as may be required. The Company reserves the right to restrict, in whole or in
part, the delivery of Common Shares pursuant to any Award prior to the satisfaction of all legal requirements relating to the issuance of such Common Shares, to their registration, qualification or listing or to an exemption from registration,
qualification or listing. The inability or impracticability of the Company to obtain or maintain authority from any regulatory body having jurisdiction, which authority is deemed by the Company’s counsel to be necessary to the lawful issuance
and sale of any Common Shares hereunder, will relieve the Company of any liability in respect of the failure to issue or sell such Common Shares as to which such requisite authority will not have been obtained or maintained, and shall enable the
Administrator to cancel Awards pertaining to such Common Shares, with or without consideration to the Participant. 
 11.4
Transferability of Awards. The Administrator may, in its sole discretion, permit transfer of an Award in a manner consistent with applicable law (including, other than an ISO, to a “family member” as such term is
defined in the General Instructions to Form S-8 (whether by gift or a domestic relations order)). Unless otherwise determined by the Administrator, Awards shall be transferable by a Participant only by
(a) beneficiary designation (if permitted by the Administrator and valid under applicable law), (b) a will or (c) the laws of descent and distribution; provided that, in any event, an ISO may only be transferred by will or by the laws of
descent and distribution and may be exercised during the lifetime of the Optionee only by the Optionee or by the Optionee’s guardian or legal representative. Any transferee shall be bound by and subject to all of the terms and conditions of the
Plan and the Award Agreement relating to the transferred Award and shall execute an agreement satisfactory to the Company evidencing such obligations. 

11.5 Recoupment Policy. All Awards granted under the Plan, all amounts paid under the Plan and all Common Shares issued under
the Plan shall be subject to recoupment, clawback or recovery by the Company in accordance with applicable law and with Company policy (whenever adopted) regarding same, whether or not such policy is intended to satisfy the requirements of the
Dodd-Frank Wall Street Reform and Consumer Protection Act, the Sarbanes-Oxley Act, or other applicable law, as well as any implementing regulations and/or listing standards thereunder. 

 11.6 Other Conditions and Restrictions on Common Shares. Any Common Shares
issued under the Plan shall be subject to such forfeiture conditions, rights of repurchase, rights of first refusal, other transfer restrictions and such other terms and conditions as the Administrator may determine. Such conditions and restrictions
shall be set forth in the applicable Award Agreement and shall apply in addition to any restrictions that may apply to holders of Common Shares generally. In addition, Common Shares issued under the Plan shall be subject to such conditions and
restrictions imposed either by applicable law or by Company policy, as adopted from time to time, designed to ensure compliance with applicable law or laws with which the Company determines in its sole discretion to comply including in order to
maintain any statutory, regulatory or tax advantage. 
 ARTICLE 12. TAXES. 

12.1 General. It is a condition to each Award under the Plan that a Participant or their successor shall make arrangements
satisfactory to the Company for the satisfaction of any federal, state, local or foreign withholding tax obligations that arise in connection with any Award granted under the Plan. The Company shall not be required to issue any Common Shares or make
any cash payment under the Plan unless such obligations are satisfied. 
 12.2 Withholding. At the Company’s discretion
and subject to any Company insider trading policy (including black-out periods), any withholding obligation for Tax-Related Items may be satisfied by (i) deducting
an amount sufficient to satisfy such withholding obligation from any payment of any kind otherwise due to a Participant; (ii) accepting a payment from the Participant in cash, by wire transfer of immediately available funds, or by check made
payable to the order of the Company, a Parent, Subsidiary or Affiliate, as applicable; (iii) accepting the delivery of Common Shares, including Common Shares delivered by attestation; (iv) retaining Common Shares from the Award creating
the withholding obligation for Tax-Related Items, valued on the date of delivery, (v) if there is a public market for Common Shares at the time the withholding obligation for Tax-Related Items is satisfied, selling Common Shares issued pursuant to the Award creating the withholding obligation for Tax-Related Items, either voluntarily by the
Participant or mandatorily by the Company; (vi) accepting delivery of a promissory note or any other lawful consideration; or (vii) any combination of the foregoing payment forms. The amount withheld pursuant to any of the foregoing
payment forms shall be determined by the Company and may be up to, but no greater than, the aggregate amount of such obligations based on the maximum statutory withholding rates in the applicable Participant’s jurisdiction for all Tax-Related Items that are applicable to such taxable income. 
 If any withholding obligation for Tax-Related Items will be satisfied under clause (iii) of the preceding paragraph, any payment of Tax-Related Items by assigning Common Shares to the Company may be
subject to restrictions including any restrictions required by U.S. Securities and Exchange Commission, accounting, or other rules. 
 If
any withholding obligation for Tax-Related Items will be satisfied under clause (v) of the preceding paragraph, each Participant’s acceptance of an Award under the Plan will constitute the
Participant’s authorization to the Company and instruction and authorization to any brokerage firm selected by the Company to effect the sale to complete the transactions described in clause (v). 

 12.3 Section 409A Matters. Except as otherwise expressly set forth in an Award
Agreement, it is intended that Awards granted under the Plan either be exempt from, or comply with, the requirements of Code Section 409A. To the extent an Award is subject to Code Section 409A (a “409A Award”), the terms
of the Plan, the Award and any written agreement governing the Award shall be interpreted to comply with the requirements of Code Section 409A so that the Award is not subject to additional tax or interest under Code Section 409A, unless
the Administrator expressly provides otherwise. A 409A Award shall be subject to such additional rules and requirements as specified by the Administrator from time to time in order for it to comply with the requirements of Code Section 409A. In
this regard, if any amount under a 409A Award is payable upon a “separation from service” to an individual who is considered a “specified employee” (as each term is defined under Code Section 409A), then no such payment
shall be made prior to the date that is the earlier of (i) six months and one day after the Participant’s separation from service or (ii) the Participant’s death, but only to the extent such delay is necessary to prevent such
payment from being subject to Code Section 409A(a)(1). 
 12.4 Limitation on Liability. Neither the Company nor any
person serving as Administrator shall have any liability to a Participant in the event an Award held by the Participant fails to achieve its intended characterization under applicable tax law. 

ARTICLE 13. FUTURE OF THE PLAN. 

13.1 Term of the Plan. The Plan, as set forth herein, shall become effective on the IPO Date, subject to approval of the
Company’s stockholders under Article 13.3 below. The Plan shall terminate automatically 10 years after the date on which the stockholders approve the Plan. 

13.2 Amendment or Termination. The Board may, at any time and for any reason, amend or terminate the Plan. No Awards shall be
granted under the Plan after the termination thereof. The termination of the Plan, or any amendment thereof, shall not affect any Award previously granted under the Plan. 

13.3 Stockholder Approval. To the extent required by applicable law, the Plan will be subject to the approval of the
Company’s stockholders within 12 months of its adoption date. An amendment of the Plan shall be subject to the approval of the Company’s stockholders only to the extent required by applicable laws, regulations or rules. 

ARTICLE 14. DEFINITIONS. 

14.1 “Administrator” means the Board or any Committee administering the Plan in accordance with Article 2. 

14.2 “Affiliate” means any entity other than a Subsidiary, if the Company and/or one or more Subsidiaries own not less
than 50% of such entity. 
 14.3 “Award” means any award granted under the Plan, including as an Option, a SAR, a
Restricted Share award, a Restricted Stock Unit award or another form of equity-based compensation award. 
 14.4 “Award
Agreement” means a Stock Option Agreement, a SAR Agreement, a Restricted Stock Agreement, a Restricted Stock Unit Agreement or such other agreement evidencing an Award granted under the Plan. 

 14.5 “Board” means the Company’s Board of Directors, as
constituted from time to time and, where the context so requires, reference to the “Board” may refer to a Committee to whom the Board has delegated authority to administer any aspect of this Plan. 

14.6 “Change in Control” means: 

(a) Any “person” (as such term is used in Sections 13(d) and 14(d) of the Exchange Act) becomes the “beneficial owner” (as
defined in Rule 13d-3 of the Exchange Act), directly or indirectly, of securities of the Company representing more than fifty percent (50%) of the total voting power represented by the Company’s
then-outstanding voting securities; 
 (b) The consummation of the sale or disposition by the Company of all or substantially all of the
Company’s assets; 
 (c) The consummation of a merger or consolidation of the Company with or into any other entity, other than a
merger or consolidation which would result in the voting securities of the Company outstanding immediately prior thereto continuing to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity or
its parent) more than fifty percent (50%) of the total voting power represented by the voting securities of the Company or such surviving entity or its parent outstanding immediately after such merger or consolidation; or 

(d) Individuals who are members of the Board (the “Incumbent Board”) cease for any reason to constitute at least a majority
of the members of the Board over a period of 12 months; provided, however, that if the appointment or election (or nomination for election) of any new Board member was approved or recommended by a majority vote of the members of the Incumbent Board
then still in office, such new member shall, for purposes of this Plan, be considered as a member of the Incumbent Board. 
 A transaction shall not
constitute a Change in Control if its sole purpose is to change the state of the Company’s incorporation or to create a holding company that will be owned in substantially the same proportions by the persons who held the Company’s
securities immediately before such transaction. In addition, if a Change in Control constitutes a payment event with respect to any Award which provides for a deferral of compensation and is subject to Code Section 409A, then
notwithstanding anything to the contrary in the Plan or applicable Award Agreement the transaction with respect to such Award must also constitute a “change in control event” as defined in Treasury Regulation
Section 1.409A-3(i)(5) to the extent required by Code Section 409A. 
 14.7
“Code” means the U.S. Internal Revenue Code of 1986, as amended. 
 14.8 “Committee” means a
committee of one or more members of the Board, or of other individuals satisfying applicable laws, appointed by the Board to administer the Plan. 

14.9 “Common Share” means one share of the Company’s Class A Common Stock. 

14.10 “Company” means Backblaze, Inc., a Delaware corporation. 

14.11 “Consultant” means a consultant or adviser who provides bona fide services to the Company, a Parent, a
Subsidiary or an Affiliate as an independent contractor and who qualifies as a consultant or advisor under Instruction A.1.(a)(1) of Form S-8 under the Securities Act. 

 14.12 “Employee” means a
common-law employee of the Company, a Parent, a Subsidiary or an Affiliate. 
 14.13
“Exchange Act” means the U.S. Securities Exchange Act of 1934, as amended. 
 14.14 “Exercise
Price,” in the case of an Option, means the amount for which one Common Share may be purchased upon exercise of such Option, as specified in the applicable Stock Option Agreement. “Exercise Price,” in the case of a SAR, means an
amount, as specified in the applicable SAR Agreement, which is subtracted from the Fair Market Value of one Common Share in determining the amount payable upon exercise of such SAR. 

14.15 “Fair Market Value” means the closing price of a Common Share on any established stock exchange or a national
market system on the applicable date or, if the applicable date is not a trading day, on the last trading day prior to the applicable date, as reported in a source that the Administrator deems reliable. If Common Shares are not traded on an
established stock exchange or a national market system, the Fair Market Value shall be determined by the Administrator in good faith on such basis as it deems appropriate. The Administrator’s determination shall be conclusive and binding on all
persons. Notwithstanding the foregoing, the determination of Fair Market Value in all cases shall be in accordance with the requirements set forth under Section 409A of the Code to the extent necessary for an Award to comply with, or be
exempt from, Section 409A of the Code. 
 14.16 “ISO” means an incentive stock option described in Code
Section 422(b). 
 14.17 “IPO Date” means the effective date of the registration statement filed by the Company
with the U.S. Securities and Exchange Commission for its initial offering of the Common Shares to the public. 
 14.18
“NSO” means a stock option not described in Code Sections 422 or 423. 
 14.19 “Option” means
an ISO or NSO granted under the Plan and entitling the holder to purchase Common Shares. 
 14.20 “Optionee” means
an individual or estate holding an Option or SAR. 
 14.21 “Outside Director” means a member of the Board who is not
an Employee. 
 14.22 “Parent” means any corporation (other than the Company) in an unbroken chain of corporations
ending with the Company, if each of the corporations other than the Company owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. A corporation that attains the
status of a Parent on a date after the adoption of the Plan shall be considered a Parent commencing as of such date. 
 14.23
“Participant” means an individual or estate holding an Award. 

 14.24 “Plan” means this Backblaze, Inc. 2021 Equity Incentive Plan,
as amended from time to time. 
 14.25 “Predecessor Plan” means the Company’s 2011 Stock Plan. 

14.26 “Restricted Share” means a Common Share awarded under the Plan. 

14.27 “Restricted Stock Agreement” means the agreement consistent with the terms of the Plan between the Company and
the recipient of a Restricted Share that contains the terms, conditions and restrictions pertaining to such Restricted Share. 

14.28 “Restricted Stock Unit” means a bookkeeping entry representing the equivalent of one Common Share, as awarded
under the Plan. 
 14.29 “Restricted Stock Unit Agreement” means the agreement consistent with the terms of the Plan
between the Company and the recipient of a Restricted Stock Unit that contains the terms, conditions and restrictions pertaining to such Restricted Stock Unit. 

14.30 “SAR” means a stock appreciation right granted under the Plan. 

14.31 “SAR Agreement” means the agreement consistent with the terms of the Plan between the Company and an Optionee
that contains the terms, conditions and restrictions pertaining to their SAR. 
 14.32 “Securities Act” means the
U.S. Securities Act of 1933, as amended. 
 14.33 “Service Provider” means any individual who is an Employee,
Outside Director or Consultant, including any prospective Employee, Outside Director or Consultant who has accepted an offer of employment or service and will be an Employee, Outside Director or Consultant after the commencement of their service.

 14.34 “Stock Option Agreement” means the agreement consistent with the terms of the Plan between the Company and
an Optionee that contains the terms, conditions and restrictions pertaining to their Option. 
 14.35 “Subsidiary”
means any corporation (other than the Company) in an unbroken chain of corporations beginning with the Company, if each of the corporations other than the last corporation in the unbroken chain owns stock possessing 50% or more of the total combined
voting power of all classes of stock in one of the other corporations in such chain. A corporation that attains the status of a Subsidiary on a date after the adoption of the Plan shall be considered a Subsidiary commencing as of such date. 

14.36 “Substitute Awards” means Awards or Common Shares issued by the Company in assumption of, or substitution or
exchange for, awards previously granted, or the right or obligation to make future awards, in each case by a corporation acquired by the Company or any Affiliate or with which the Company or any Affiliate combines to the extent permitted by the
applicable exchange listing requirements. 
 14.37 “Tax-Related Items” means
any U.S. and non-U.S. federal, state and/or local taxes (including, without limitation, income tax, social insurance contributions, fringe benefit tax, employment tax, stamp tax and any employer tax liability
which has been transferred to a Participant) for which a Participant is liable in connection with Awards and/or Common Shares.EX-10.4

 Exhibit 10.4 

BACKBLAZE, INC. 

2021 EMPLOYEE STOCK PURCHASE PLAN 

(AS ADOPTED ON OCTOBER 25, 2021, 

EFFECTIVE ON THE IPO DATE) 

 

 BACKBLAZE, INC. 

2021 EMPLOYEE STOCK PURCHASE PLAN 

SECTION 1. PURPOSE OF THE PLAN. 
 The
Board adopted the Plan to become effective immediately as of the IPO Date. The purpose of the Plan is to provide Eligible Employees with an opportunity to increase their proprietary interest in the success of the Company by purchasing Stock from the
Company on favorable terms and to pay for such purchases through payroll deductions or other approved contributions. 
 SECTION 2. ADMINISTRATION OF THE
PLAN. 
 (a) General. The Plan may be administered by the Board or one or more Committees. Each Committee shall comply with
rules and regulations applicable to it, including under the rules of any exchange on which the Stock is traded, and shall have the authority and be responsible for such functions as have been assigned to it. 

(b) Powers of the Administrator. Subject to the terms of the Plan, and in the case of a Committee, subject to the specific
duties delegated to the Committee, the Administrator shall interpret the Plan and make all other policy decisions relating to the operation of the Plan. The Administrator may adopt such rules, guidelines and forms as it deems appropriate to
implement the Plan. 
 (c) Effects of Administrator’s Decisions. The Administrator’s decisions, determinations and
interpretations shall be final and binding on all interested parties. 
 (d) Governing Law. The Plan shall be governed by, and
construed in accordance with, the laws of the State of Delaware (except its choice of law provisions). 
 SECTION 3. STOCK OFFERED UNDER THE PLAN.

 (a) Authorized Shares. The number of shares of Stock available for purchase under the Plan shall be 956,800 shares of
the Company’s Stock (subject to adjustment pursuant to Subsection (c) below), plus the additional shares described in Subsection (b) below. Shares of Stock issued pursuant to the Plan may be authorized but unissued shares or treasury
shares. 
 (b) Annual Increase in Shares. On the first day of each fiscal year of the Company during the term of the Plan, commencing
on January 1, 2022 and ending on (and including) January 1, 2041, the aggregate number of shares of Stock that may be issued under the Plan shall automatically increase by a number equal to the least of (i) two percent (2%) of the
total number of shares of Common Stock actually issued and outstanding on the last day of the preceding fiscal year, (ii) 1,913,630 shares of Stock (subject to adjustment pursuant to Subsection (c) below), or (iii) a number of shares
of Stock determined by the Board. 

 (c) Anti-Dilution Adjustments. In the event that any dividend or other distribution
(whether in the form of cash, stock or other securities or other property), recapitalization, stock split, reverse stock split, reorganization, merger, consolidation, split-up,
spin-off, combination, reclassification, repurchase, or exchange of Stock or other securities of the Company, or other similar change in the corporate structure of the Company affecting the Stock and effected
without receipt or payment of consideration by the Company occurs, then in order to prevent dilution or enlargement of the benefits or potential benefits intended to be made available under the Plan, there will be a proportionate adjustment of the
number and class of Stock that may be delivered under the Plan, the Purchase Price per share and the number and class of Stock covered by each option under the Plan which has not yet been exercised, and the numerical limits of Sections 3(a),
3(b)(ii) and 9(c). 
 (d) Reorganizations. In the event of a Corporate Reorganization, the outstanding rights to purchase Stock under
any Offering Period then in progress may be continued, assumed or substituted by the surviving entity or its parent. If such acquirer refuses to continue, assume or substitute for any such rights, then a new Purchase Date for such Offering Period(s)
will be set prior to the effective time of the Corporate Reorganization, the Participants’ accumulated contributions will be applied to purchase Stock on such date, and any such Offering Periods shall terminate immediately after such purchase.
In the event a new Purchase Date is set under this Section 3(d), Participants will be given notice of the new Purchase Date. The Plan shall in no event be construed to restrict in any way the Company’s right to undertake a dissolution,
liquidation, merger, consolidation or other reorganization. 
 SECTION 4. ENROLLMENT AND PARTICIPATION. 

(a) Offering Periods and Purchase Periods.  
  

	 	(i)	 Initial Offering and Base Offering Periods. Unless changed by the Administrator, the Initial Offering
Period (the “Initial Offering Period”) shall begin on the IPO Date and end on November 19, 2023 and shall consist of four consecutive Purchase Periods beginning on the IPO Date, May 20, 2022, November 20, 2022 and
May 20, 2023, and ending respectively on May 19, 2022, November 19, 2022, May 19, 2023 and November 19, 2023, as applicable. Following commencement of the Initial Offering Period, unless changed by the Administrator, a new
Offering Period of 24 months duration shall begin on each November 20 and May 20, as applicable, (each, a “Base Offering Period”); provided that a Base Offering Period shall in no event be longer than 27 months (or such
other period as may be imposed under applicable tax law). Each Base Offering Period shall contain such terms and conditions (consistent with the Plan) as the Administrator deems appropriate. Within the limits of the Plan, the Administrator may
change the frequency, duration and other terms and conditions of the Base Offering Periods as it deems appropriate from time to time. The Initial Offering and Base Offering Periods are intended to qualify under Code Section 423.

	 	(ii)	 Additional Offering Periods. At the discretion of the Administrator, additional Offering Periods (the
“Additional Offering Periods”) may be conducted under the Plan including, if necessary or advisable in the sole discretion of the Administrator, under a separate sub-plan or sub-plans, permitting grants to Eligible Employees of certain Participating Companies (each, a “Sub-Plan”). Such Additional Offering Periods may be designed
to achieve desired tax objectives in particular locations outside the United States or to comply with local laws applicable to offerings in such foreign jurisdictions and will not be intended to qualify under Code Section 423. The Administrator
shall determine the commencement and duration of each Additional Offering Period, which may be consecutive or overlapping. The other terms and conditions of each Additional Offering Period shall be those set forth in this Plan document or in terms
and conditions approved by the Administrator with respect to such Additional Offering Period (whether or not set forth in a written Sub-Plan), with such changes or additional features as the Administrator
determines necessary to comply with local law. Each Additional Offering Period (whether or not set forth in a written Sub-Plan) shall be considered a separate plan from the Plan (the “Statutory
Plan”). The total number of shares authorized to be issued under the Plan as provided in Section 3 above applies in the aggregate to the Statutory Plan and any Additional Offering Period. Unless otherwise superseded by the terms and
conditions approved by the Administrator with respect to an Additional Offering Period, the provisions of this Plan document shall govern the operation of any offering conducted hereunder. 

 

	 	(iii)	 Termination of Offering Period. Unless changed by the Administrator, if the Fair Market Value of a share
of Stock on any given Purchase Date is less than the Fair Market Value of a share of Stock on the start date of the applicable Offering Period, then the Offering Period shall terminate and a new Offering Period shall commence. For the avoidance of
doubt, a Participant shall not be deemed to withdraw from the Plan in the event of a termination of an Offering Period pursuant to this Section 4(a)(iii). 

 

	 	(iv)	 Separate Offerings. Each Base Offering Period and each Additional Offering Period conducted under the
Plan is intended to constitute a separate “offering” for purposes of Code Section 423. 

  

	 	(v)	 Equal Rights and Privileges. To the extent an Offering Period is intended to qualify under Code
Section 423, all participants in such Offering Period shall have the same rights and privileges with respect to their participation in such Offering Period in accordance with Code Section 423 and the regulations thereunder except for
differences that may be mandated by local law and are consistent with the requirements of Code Section 423(b)(5). 

(b) Enrollment at IPO. Each individual who qualifies as an Eligible Employee on the IPO Date shall automatically become a Participant
on such day, and shall be considered to have been granted an option to participate in the Initial Offering Period under the ESPP at the maximum applicable participation rate. To maintain participation in the Initial Offering Period, each Participant
who was automatically enrolled on the IPO Date must file the prescribed enrollment 

 
form (which may be in electronic format or such other method as determined by the Company) with the Company or an agent designated by the Company. The enrollment form shall be filed as prescribed
by the Company no later than 30 calendar days after the commencement of the Initial Offering Period, or such other period of time determined by the Administrator (the “Initial Enrollment Window”). If a Participant who was
automatically enrolled on the IPO Date fails to file such form during the Initial Enrollment Window, then such Participant shall be deemed to have withdrawn from the ESPP under Section 6(a). 

(c) Enrollment After IPO. In the case of any individual who qualifies as an Eligible Employee on the first day of any Offering Period
other than the Initial Offering Period, they may elect to become a Participant on such day by filing the prescribed enrollment form with the Company (which may be in electronic format or such other method as determined by the Company) or an agent
designated by the Company. The enrollment form shall be filed in the prescribed manner during the applicable Enrollment Period for such Offering Period. The Administrator may establish other procedures for enrollment by Eligible Employees. 

(d) Duration of Participation. Once enrolled in the Plan, a Participant shall continue to participate in the Plan until they:

  

	 	(i)	 Reach the end of the Offering Period or Purchase Period, as applicable, in which his or her employee
contributions were discontinued under Section 5(c) or 9(b); 

  

	 	(ii)	 Is deemed to withdraw from the ESPP under Subsection (b) above; 

 

	 	(iii)	 Withdraws from the Plan under Section 6(a); or 

 

	 	(iv)	 Ceases to be an Eligible Employee. 

A Participant whose employee contributions were discontinued automatically under Section 9(b) shall automatically resume participation as described
therein. In all other cases, a former Participant may again become a Participant, if they then are an Eligible Employee, by following the procedure described in Subsection (b) above. 

(e) Applicable Offering Period. For purposes of calculating the Purchase Price under Section 8(b), the applicable Offering
Period shall be determined as follows: 
  

	 	(i)	 Once a Participant is enrolled in the Plan for an Offering Period, such Offering Period shall continue to apply
to him or her until the earliest of (A) the end of such Offering Period, (B) the end of his or her participation under Subsection (d) above, or (C) re-enrollment for a subsequent Offering
Period under Paragraph (ii) or (iii) below. 

  

	 	(ii)	 Any other provision of the Plan notwithstanding, the Administrator (at its sole discretion) may determine prior
to the commencement of any new Offering Period that all Participants shall be re-enrolled for such new Offering Period. In addition, the Administrator may structure an Offering Period so that in the event that
the Fair Market Value of a Share on the first 

	 	
day of the Offering Period for which the Participant is enrolled is higher than on the first day of any subsequent Offering Period, the Participant shall automatically be re-enrolled for such subsequent Offering Period. 

  

	 	(iii)	 When a Participant reaches the end of an Offering Period but his or her participation is to continue, then such
Participant shall automatically be re-enrolled for the Offering Period that commences immediately after the end of the prior Offering Period including any Offering Period commencing under
Section 4(a)(iii) above. 

 SECTION 5. EMPLOYEE CONTRIBUTIONS. 

(a) Commencement of Payroll Deductions. A Participant may purchase shares of Stock under the Plan by means of payroll deductions
or (if so approved by the Administrator with respect to all Participants in a Base Offering Period) other approved contributions in form and substance satisfactory to the Administrator. Payroll deductions or other approved contributions shall
commence as soon as reasonably practicable after the Company has received the prescribed enrollment form. In jurisdictions where payroll deductions are not permitted under local law, Participants may purchase shares of Stock by making contributions
in the form that is acceptable and approved by the Administrator. 
 (b) Amount of Payroll Deductions. An Eligible Employee
shall designate on the prescribed enrollment form the portion of his or her Compensation that they elect to have withheld for the purchase of Stock. Such portion shall be a whole percentage of the Eligible Employee’s Compensation, established
by the Administrator for an Offering Period but not more than fifty percent (50%). 
 (c) Reducing Withholding Rate or Discontinuing
Payroll Deductions. If a Participant wishes to reduce his or her rate of payroll withholding, such Participant may do so by filing a new enrollment form with the Company in the manner prescribed by the Administrator. Unless the
Administrator establishes a different rule, the new withholding rate shall be effective as of the first full payroll period following five (5) business days after the date on which the Company has received such form. The new withholding rate
may be 0% or any whole percentage of the Participant’s Compensation. Unless the Administrator establishes a different rule, a Participant shall not be limited in the number of times he or she may elect to reduce his or her rate of withholding
during any Offering Period and/or Purchase Period. (In addition, employee contributions may be discontinued automatically pursuant to Section 9(b).) 

(d) Increasing Withholding Rate. Unless the Administrator establishes a different rule for an Offering Period, a Participant
shall not be limited in the number of times he or she may increase his or her rate of payroll withholding during a Purchase Period. If a Participant wishes to increase his or her rate of payroll withholding, such Participant may do so by filing a
new enrollment form with the Company. Unless the Administrator establishes a different rule, the new withholding rate shall be effective as of the first full payroll period following five (5) business days after the date on which the Company
has received such form. The new withholding rate may be any whole percentage of the Participant’s Compensation, but not more than the maximum amount established for the Offering Period. 

 SECTION 6. WITHDRAWAL FROM THE PLAN. 

(a) Withdrawal. A Participant may elect to withdraw from the Plan (and the Offering Period in which they are participating) by
filing the prescribed form with the Company in the prescribed manner at least fifteen (15) calendar days prior to a Purchase Date (or such other period as is specified by the Administrator). As soon as reasonably practicable thereafter, payroll
deductions or other approved contributions shall cease and the entire amount credited to the Participant’s Plan Account with respect to such Offering Period shall be refunded to him or her in cash, without interest (except as otherwise required
by the laws of the local jurisdiction). No partial withdrawals from an Offering Period shall be permitted. 
 (b) Re-Enrollment After Withdrawal. A former Participant who has withdrawn from the Plan shall not be a Participant until they re-enroll in the Plan under
Section 4(b) during an Enrollment Period. Re-enrollment may be effective only at the commencement of an Offering Period. 

SECTION 7. CHANGE IN EMPLOYMENT STATUS. 

(a) Termination of Employment. Termination of employment as an Eligible Employee for any reason, including death, shall be
treated as an automatic withdrawal from the Plan under Section 6(a). 
 (b) Transfers of Employment. If a Participant
transfers employment from a Participating Company that is participating in the Initial Offering Period or a Base Offering Period to a Participating Company that is participating in an Additional Offering Period, they will immediately cease to
participate in the Initial Offering Period or Base Offering Period, as applicable; however, such Participant’s Plan Account will be transferred to the Additional Offering Period, and such Participant will immediately join such Additional
Offering Period on the terms and conditions applicable to such Additional Offering Period, except for any modifications required by applicable law. If a Participant transfers employment from a Participating Company that is participating in an
Additional Offering Period to a Participating Company that is participating in the Base Offering Period, they will continue to participate in the Additional Offering Period until the earlier of (i) the end of such Additional Offering Period, or
(ii) the commencement of the first Base Offering Period in which they are eligible. If a Participant transfers employment from a Participating Company to a Related Corporation that is not a Participating Company, they shall be deemed to have
withdrawn from the Plan pursuant to Section 6(a). 
 (c) Leave of Absence. For purposes of the Plan, employment shall not
be deemed to terminate when the Participant goes on a military leave, a sick leave or another bona fide leave of absence, if the leave was approved by the Company in writing. Employment, however, shall be deemed to terminate on the first day
following three months after the Participant goes on a leave, unless a contract or statute guarantees his or her right to return to work. Employment shall be deemed to terminate in any event when the approved leave ends, unless the Participant
immediately returns to work. 

 (d) Death. In the event of the Participant’s death, the amount credited to his
or her Plan Account shall be paid in cash, without interest (unless otherwise required by the laws of the local jurisdiction), to a beneficiary designated by him or her for this purpose on the prescribed form or, if none, to the Participant’s
estate. Such form shall be valid only if it was filed with the Company in the prescribed manner before the Participant’s death. 
 SECTION 8. PLAN
ACCOUNTS AND PURCHASE OF SHARES. 
 (a) Plan Accounts. The Company shall maintain a Plan Account on its books in the name
of each Participant. Whenever an amount is deducted from the Participant’s Compensation under the Plan, such amount shall be credited to the Participant’s Plan Account. Unless otherwise required by the laws of the local jurisdiction,
(i) amounts credited to Plan Accounts shall not be trust funds and may be commingled with the Company’s general assets and applied to general corporate purposes, and (ii) no interest shall be credited to Plan Accounts. 

(b) Purchase Price. The Administrator shall establish the Purchase Price for each Offering Period; provided, however, that the
Purchase Price for each share of Stock purchased on a Purchase Date shall not be less than the lower of: 
  

	 	(i)	 85% of the Fair Market Value of such share on the first trading day of such Offering Period; or

  

	 	(ii)	 85% of the Fair Market Value of such share on the Purchase Date. 

(c) Number of Shares Purchased. On each Purchase Date, each Participant shall be deemed to have elected to purchase the number
of shares of Stock calculated in accordance with this Subsection (c), unless the Participant has previously elected to withdraw from the Offering Period in accordance with Section 6(a). The amount then in the Participant’s Plan
Account shall be divided by the Purchase Price, and the number of shares that results shall be purchased from the Company with the funds in the Participant’s Plan Account. The foregoing number of shares of Stock that may be purchased by a
Participant are subject to the limitations set forth in Subsection (d) below and in Section 9. The Administrator may determine with respect to all Participants in an Offering Period that any fractional share, as calculated under this
Subsection (c), shall be (i) rounded down to the next lower whole share or (ii) credited as a fractional share. 
 (d)
Available Shares Insufficient. In the event that the aggregate number of shares that all Participants elect to purchase with respect to a particular Purchase Period exceeds (i) the number of shares of Stock that were available
under Section 3 above for sale under the Plan on the first day of the applicable Offering Period, or (ii) the number of shares that were available under Section 3 above for sale under the Plan on the applicable Purchase Date, then the
number of shares to which each Participant is entitled shall be determined by multiplying the number of shares available for issuance by a fraction. The numerator of such fraction is the number of shares that such Participant has elected to
purchase, and the denominator of such fraction is the number of shares that all Participants have elected to purchase. The Company may make a pro rata allocation of the shares available on the first day of an applicable Offering Period pursuant to
the preceding sentence, notwithstanding any authorization of additional shares for issuance under the Plan by the Company’s stockholders subsequent to such date. In the event of a pro-rata allocation
under this Section (d), the Administrator may determine in its discretion to continue all Offering Periods then in effect or terminate all Offering Periods then in effect pursuant to Section 14. 

 (e) Issuance of Stock. The shares of Stock purchased by a Participant under
the Plan will be registered in the name of such Participant. The Company may permit or require that shares be deposited directly with a broker designated by the Company or to a designated agent of the Company, and the Company may utilize electronic
or automated methods of share transfer. The Company may require that shares be retained with such broker or agent for a designated period of time and/or may establish other procedures to permit tracking of disqualifying dispositions of such shares.
(The two preceding sentences shall apply whether or not the Participant is required to pay income tax in the United States.) 
 (f) Tax
Withholding. To the extent required by applicable U.S. federal, state, local or foreign law, a Participant shall make arrangements satisfactory to the Company for the satisfaction of any withholding tax obligations that arise in
connection with the Plan. The Company shall not be required to issue any shares of Stock under the Plan until such obligations, if any, are satisfied. 

(g) Unused Cash Balances. Subject to the final sentence of Section 8(c), any amount remaining in a Participant’s Plan
Account at the end of a Purchase Period solely by reason of the inability to purchase a fractional share will be carried over to the next Offering Period or Purchase Period, as applicable. Any amount remaining in the Participant’s Plan Account
that represents the Purchase Price for whole shares that could not be purchased by reason of Subsections (c) or (d) above or Section 9(b) shall be refunded to the Participant in cash, without interest (except as otherwise required by
the laws of the local jurisdiction). 
 (h) Stockholder Approval. Any other provision of the Plan notwithstanding, no shares
of Stock shall be purchased under the Plan unless and until the Company’s stockholders have approved the adoption of the Plan. 
 SECTION 9. PLAN
LIMITATIONS. 
 (a) Five Percent Limit. Any other provision of the Plan notwithstanding, no Participant shall be granted a
right to purchase Stock under the Plan if, immediately after such right is granted, such Participant would own stock possessing 5% or more of the total combined voting power or value of all classes of stock of the Company or any Related Corporation,
applying the stock attribution rules of Code Section 424(d), and including any stock in which the Participant may purchase under outstanding options as stock owned by such Participant. 

(b) Dollar Limit. As specified by Code Section 423(b)(8), no Participant shall be entitled to accrue rights to purchase
Stock pursuant to any such rights outstanding under the Plan if and to the extent such accrual, when aggregated with (i) rights to purchase Stock accrued under any other right to purchase Stock under the Plan, and (ii) similar rights
accrued under other employee stock purchase plans (within the meaning of Code Section 423) of the Company or any Related Corporation, would otherwise permit such Participant to purchase more than $25,000 worth of Stock of the Company or any
Related Corporation (determined on the basis of the Fair Market Value per share on the date such rights are granted, and which, with respect to the Plan, will be determined as of the beginning of the respective Offering Period) for each calendar
year such rights are at any time outstanding. 

 If a Participant is precluded by this Subsection (b) from purchasing additional Stock
under the Plan, then his or her employee contributions shall automatically be discontinued and shall automatically resume at the beginning of the next Purchase Period with a scheduled Purchase Date in the next calendar year, provided that they are
an Eligible Employee at the beginning of such Purchase Period. 
 (c) Purchase Period Share Purchase Limit. The Administrator
may establish one or more limits on the number of shares of Stock that may be purchased during any Offering Period and/or Purchase Period, including individual limits and/or aggregate limits. Unless the Administrator provides otherwise with respect
to an Offering Period, any other provision of the Plan notwithstanding, no Participant shall purchase more than 2,500 shares of Stock with respect to any Purchase Period. 

SECTION 10. RIGHTS NOT TRANSFERABLE. 
 The
rights of any Participant under the Plan, or any Participant’s interest in any Stock or moneys to which they may be entitled under the Plan, shall not be transferable by voluntary or involuntary assignment or by operation of law, or in any
other manner other than by beneficiary designation or the laws of descent and distribution. If a Participant in any manner attempts to transfer, assign or otherwise encumber his or her rights or interest under the Plan, other than by beneficiary
designation or the laws of descent and distribution, then such act shall be treated as an election by the Participant to withdraw from the Plan under Section 6(a). 

SECTION 11. NO RIGHTS AS AN EMPLOYEE. 

Nothing in the Plan or in any right granted under the Plan shall confer upon the Participant any right to continue in the employ of a
Participating Company for any period of specific duration or interfere with or otherwise restrict in any way the rights of the Participating Companies or of the Participant, which rights are hereby expressly reserved by each, to terminate his or her
employment at any time and for any reason, with or without cause. 
 SECTION 12. NO RIGHTS AS A STOCKHOLDER. 

A Participant shall have no rights as a stockholder with respect to any shares of Stock that they may have a right to purchase under the Plan
until such shares have been purchased on the applicable Purchase Date. 
 SECTION 13. SECURITIES LAW REQUIREMENTS. 

Shares of Stock shall not be issued, and the Company shall have no liability for failure to issue shares of Stock, under the Plan unless the
issuance and delivery of such shares comply with (or are exempt from) all applicable requirements of law, including (without limitation) the Securities Act of 1933, as amended, the rules and regulations promulgated thereunder, state securities laws
and regulations, and the regulations of any stock exchange or other securities market on which the Company’s securities may then be traded. 

 SECTION 14. AMENDMENT OR DISCONTINUANCE. 

(a) General Rule. The Administrator, in its sole discretion, may amend, suspend, or terminate the Plan, or any part thereof, at
any time and for any reason. If the Plan is terminated, the Administrator, in its discretion, may elect to terminate all outstanding Offering Periods either immediately or upon completion of the purchase of shares of Stock on the next Purchase Date,
or may elect to permit Offering Periods to expire in accordance with their terms (and subject to any adjustment pursuant to Section 3(c) or (d)). If the Offering Periods are terminated prior to expiration, all amounts then credited to
Participants’ accounts which have not been used to purchase shares of Stock will be returned to the Participants (without interest thereon, except as otherwise required by the laws of the local jurisdiction) as soon as administratively
practicable. 
 (b) Administrator’s Discretion. Without stockholder consent and without limiting Subsection
(a) above, the Administrator will be entitled to change the Offering Periods, limit the frequency and/or number of changes in the amount withheld during an Offering Period, establish the exchange ratio applicable to amounts withheld in a
currency other than U.S. dollars, permit payroll withholding in excess of the amount designated by a Participant in order to adjust for delays or mistakes in the Company’s processing of properly completed withholding elections (after
consideration of accounting treatment of such excess withholding), establish reasonable waiting and adjustment periods and/or accounting and crediting procedures to ensure that amounts applied toward the purchase of Stock for each Participant
properly correspond with amounts withheld from the Participant’s Compensation, amend any outstanding purchase rights or clarify any ambiguities regarding the terms of any Offering Period to enable the purchase rights to qualify under and/or
comply with Section 423 of the Code, and establish such other limitations or procedures as it determines in its sole discretion advisable which are consistent with the Plan. The actions of the Administrator pursuant to this paragraph will not
be considered to alter or impair the purchase rights granted under an Offering Period as they are to be deemed part of the initial terms of such Offering Period and purchase rights. 

(c) Accounting Considerations. In the event the Administrator determines that the ongoing operation of the Plan may
result in unfavorable financial accounting consequences, the Administrator may, in its discretion and, to the extent necessary or desirable, modify, amend or terminate the Plan to reduce or eliminate such accounting consequence including, but not
limited to: 
  

	 	(i)	 Amending the Plan to conform with the safe harbor definition under Financial Accounting Standards Board
Accounting Standards Codification Topic 718 (or successor provision), including with respect to an Offering Period underway at the time; 

  

	 	(ii)	 Reducing the Purchase Price for any Offering Period including an Offering Period underway at the time of the
change in Purchase Price; 

  

	 	(iii)	 Shortening any Offering Period (and any Purchase Periods encompassed by such Offering Period) by setting a new
Purchase Date, including with respect to an Offering Period underway at the time of the Administrator’s action; 

	 	(iv)	 Reducing the maximum percentage of Compensation a Participant may elect to set aside as payroll deductions; and

  

	 	(v)	 Reducing the maximum number of shares of Stock a Participant may purchase during any Purchase Period.

 Such modifications or amendments will not require stockholder approval or the consent of any Plan Participants. The actions of the
Administrator pursuant to this paragraph will not be considered to alter or impair the purchase rights granted under an Offering Period as they are to be deemed part of the initial terms of such Offering Period and purchase rights. 

(d) Stockholder Approval. Except as provided in Section 3, any increase in the aggregate number of shares of Stock that may
be issued under the Plan shall be subject to the approval of the Company’s stockholders. In addition, any other amendment of the Plan shall be subject to the approval of the Company’s stockholders to the extent required under
Section 14(e) or by any applicable law or regulation. 
 (e) Plan Termination. The Plan shall terminate automatically 20
years after its effective date, unless (i) the Plan is extended by the Board and (ii) the extension is approved within 12 months by a vote of the stockholders of the Company. 

SECTION 15. DEFINITIONS. 
 (a)
“Administrator” means the Board or any Committee administering the Plan in accordance with Section 2. 
 (b)
“Board” means the Board of Directors of the Company, as constituted from time to time. 
 (c) “Code” means
the Internal Revenue Code of 1986, as amended. 
 (d) “Committee” means a committee of one or more members of the Board, or
of other individuals satisfying applicable laws, appointed by the Board to administer the Plan. 
 (e) “Company” means
Backblaze, Inc., a Delaware corporation. 
 (f) “Compensation” means, unless otherwise determined by the Administrator with
respect to an Offering Period, those components of a Participant’s cash compensation (prior to reductions pursuant to Code Sections 125, 132(f) or 401(k)) that are regular and recurring, including cash base salary or base hourly pay but
excluding any overtime pay or shift differentials, commissions, annual cash incentive compensation, and annual cash bonuses, and further excluding extraordinary cash items (such as one-time
bonuses), as well as all non-cash items, moving or relocation allowances, cost-of-living or tax equalization payments, car
allowances, tuition reimbursements, imputed income attributable to cars or life insurance, severance pay, fringe benefits, contributions or benefits received under employee benefit plans, payments for or related to equity compensation, and any
similar items. The Administrator shall determine whether a particular item is included in Compensation. 

 (g) “Corporate Reorganization” means: 

 

	 	(i)	 The consummation of a merger or consolidation of the Company with or into another entity or any other corporate
reorganization; or 

  

	 	(ii)	 The sale, transfer or other disposition of all or substantially all of the Company’s assets or the
complete liquidation or dissolution of the Company. 

 (h) “Eligible Employee” means a common law
employee of a Participating Company, provided, however, that the Administrator may exclude one or more of the following categories of employees (where exclusion of such employees is permitted by applicable law) from any Offering Period:
(i) employees who have been employed less than two years (or any shorter period of time established for an Offering Period), (ii) employees who are customarily employed twenty (20) or less hours per week (or any lesser number of hours per
week established for an Offering Period), (iii) employees who are customarily employed for five (5) months or less in a calendar year (or any lesser number of months in a calendar year established for an Offering Period), (iv) “highly
compensated employees” (within the meaning of Code Section 414(q)) or (v) “highly compensated employees” (within the meaning of Code Section 414(q)) with compensation above a certain level and/or who are subject to the
disclosure requirements of Section 16(a) of the Exchange Act. In addition, an individual shall not be considered an Eligible Employee if his or her participation in the Plan is prohibited by the law of any country that has jurisdiction over him
or her or if complying with the laws of the applicable foreign jurisdiction would cause the Plan or an Offering Period to violate the requirements of Code Section 423. With respect to a Base Offering Period, any criteria used to determine
Eligible Employees shall be determined in a manner consistent with Code Section 423. In the case of an Offering Period that is not intended to qualify under Code Section 423, the Administrator may exclude any individual(s) from
participation if the Administrator determines the participation of such individual(s) is not advisable or practicable. 
 (i)
“Enrollment Period” means a period prior to the start of an Offering Period during which Eligible Employees must submit the required enrollment forms to participate in such Offering Period, which period shall end at least five
(5) business days (or such other date as may be specified in advance by the Administrator) prior to the start of the Offering Period. 

(j) “Exchange Act” means the Securities Exchange Act of 1934, as amended. 

(k) “Fair Market Value” means the price at which Stock was last sold in the principal U.S. market for the Stock on the
applicable date or, if the applicable date was not a trading day, on the last trading day prior to the applicable date. If Stock is no longer traded on a public U.S. securities market, the Fair Market Value shall be determined by the Administrator
in good faith on such basis as it deems appropriate. The Administrator’s determination shall be conclusive and binding on all persons. For purposes of the Initial Offering Period, the Fair Market Value on the first day of such Initial Offering
Period shall be the price to public set forth on the cover page of the final prospectus for the IPO. 
 (l) “IPO” means the
Company’s initial public offering of Stock to the public. 

 (m) “IPO Date” means the effective date of the registration statement filed
by the Company with the U.S. Securities and Exchange Commission for its initial offering of Stock to the public. 
 (n) “Offering
Period” means any period, including as the context requires the Initial Offering Period, Base Offering Periods and Additional Offering Periods, with respect to which the right to purchase Stock may be granted under the Plan, as determined
pursuant to Section 4(a). The first day of an Offering Period refers where the context so requires to the first trading day of the Offering Period. 

(o) “Participant” means an Eligible Employee who participates in the Plan or any
Sub-Plan, as provided in Section 4. 
 (p) “Participating Company” means
(i) the Company and (ii) each present or future Subsidiary designated by the Administrator as a Participating Company. 
 (q)
“Plan” means this Backblaze, Inc. 2021 Employee Stock Purchase Plan, as it may be amended from time to time. 
 (r)
“Plan Account” means the account established for each Participant pursuant to Section 8(a). 
 (s) “Purchase
Date” means the last trading day of a Purchase Period. 
 (t) “Purchase Period” means a period within an Offering
Period (which for an Offering Period with only a single Purchase Period would be coterminous with the Offering Period) during which contributions may be made toward the purchase of Stock under the Plan, as determined pursuant to Section 4(a).

 (u) “Purchase Price” means the price at which Participants may purchase Stock under the Plan, as determined pursuant to
Section 8(b). 
 (v) “Related Corporation” means any “parent corporation” of the Company as defined in Code
Section 424(e) or any Subsidiary. 
 (w) “Stock” means the Class A Common Stock of the Company. 

(x) “Subsidiary” means any corporation (other than the Company) in an unbroken chain of corporations beginning with the
Company, if each of the corporations other than the last corporation in the unbroken chain owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other corporations in such chain.

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