Document:

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                                                                   EXHIBIT 10.10

                                                 Grant No:[[Grantno]]

                           IRON MOUNTAIN INCORPORATED

                        INCENTIVE STOCK OPTION AGREEMENT

     This Agreement made as of this [[Dayth]] day of [[Month]], 199[[yr]] by and
between Iron Mountain Incorporated, a Delaware corporation (the "Company"), and
[[FullName]] (the "Optionee").

                                WITNESSETH THAT:

     WHEREAS, the Company has instituted a program entitled "Iron Mountain
Incorporated 1995 Stock Incentive Plan," as amended (the "Plan"); and

     WHEREAS, the Board of Directors of the Company (the "Board"), upon the
recommendation of the Stock Incentive Plan Subcommittee of the Compensation
Committee, has authorized the grant of stock options upon certain terms and
conditions set forth below; and

     WHEREAS, the Board has authorized the grant of this stock option pursuant
and subject to the terms of the Plan, a copy of which is attached hereto and
incorporated herein; and

     WHEREAS, the Board has designated this stock option an incentive stock
option in accordance with Section 5 of the Plan;

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
and agreements herein contained, the Company and the parties hereto agree as
follows:

     1. GRANT. Subject to the terms of the Plan and this Agreement, the Company
hereby grants to the Optionee a stock option (the "Option") to purchase from the
Company [[Shares]] shares of its Common Stock ("Stock"). This Option is intended
to constitute an "incentive stock option" within the meaning of Section 422 of
the Internal Revenue Code of 1986, as amended (the "Code").

     2. OPTION PRICE. This Option may be exercised at the option price
of[[Price]]per share of Stock, subject to adjustment as provided herein and in
the Plan.

     3. TERM AND EXERCISABILITY OF OPTION. This Option shall expire on the
earlier of [[yrs10]] or the last day of the exercise period determined pursuant
to subsection (c) of this Section 3. At any time before its expiration, this
Option may be exercised to the extent set forth in the following schedule,
provided that:

          (a)  at the time of exercise the Optionee is not in violation of any
     Employee Confidentiality and Non-Competition Agreement with the Company or
     a Subsidiary; and

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          (b)  the Optionee's employment or other contractual relationship with
     the Company or a Subsidiary ("Relationship") must be in effect on a given
     date in order for any scheduled increment in the exercisable portion of the
     option to become effective; and

          (c)  this Option may not be exercised after the sixtieth (60th) day
     following the date of termination of the Relationship between the Optionee
     and the Company, except that if the Relationship terminates by reason of
     the Optionee's death or total and permanent disability (as determined by
     the Board on the basis of medical advice satisfactory to it), the
     unexercised portion of the option that is otherwise exercisable on the date
     of termination of the Relationship shall remain exercisable thereafter for
     no less than one (1) year. For purposes of this subsection (c), the term
     "Company" refers to the Company and all Subsidiaries.

     Percentage of Total Option

<Table>
<Caption>
          Date                                          Shares Subject to Exercise
          ----                                        -----------------------------
                                                      Incremental        Cumulative
                                                        Amount             Amount
                                                      -----------        ----------
          <S>                                             <C>               <C>
          On or after[[vestdate]], 1998                   20%                20%

          On or after[[vestdate]], 1999                   20%                40%

          On or after[[vestdate]], 2000                   20%                60%

          On or after[[vestdate]], 2001                   20%                80%

          On or after[[vestdate]], 2002                   20%               100%
</Table>

     4. METHOD OF EXERCISE. To the extent that the right to purchase shares of
Stock has accrued hereunder, this Option may be exercised from time to time by
written notice to the Company, substantially in the form attached hereto as
Exhibit 1, stating the number of shares with respect to which this Option is
being exercised, and accompanied by either (a) payment in full of the option
price for the number of shares to be delivered, by means of payment acceptable
to the Company in accordance with Section 5(c) of the Plan, or (b) a description
of a "cashless exercise" procedure and such other documents and undertakings as
are necessary to satisfy that procedure. As soon as practicable after its
receipt of such notice, the Company shall, without transfer or issue tax to the
Optionee (or other person entitled to exercise this Option), deliver to the
Optionee (or other person entitled to exercise this Option), at the principal
executive offices of the Company or such other place as shall be mutually
acceptable, a certificate or certificates for such shares out of theretofore
authorized but unissued shares or reacquired shares of its Stock as the Company
may elect; provided, however, that the time of such delivery may be postponed by
the Company for such period as may be required for it with reasonable diligence
to comply with any applicable requirements of law. Payment of the option price
may be made in cash or cash equivalents, or, in accordance with the terms and
conditions of Section 5(c) of the Plan, in whole or in part in shares of Common
Stock of the Company; provided, however, that the Board reserves the right upon
receipt of any written notice of exercise from the Optionee to require payment
in cash with respect to the shares contemplated in such notice; and provided,
further,

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that the Optionee may not make payment in shares of Stock that he acquired upon
the earlier exercise of any incentive stock option, unless he has held the
shares until at least two (2) years after the date the incentive stock option
was granted and at least one (1) year after the date the incentive stock option
was exercised. If the Optionee (or other person entitled to exercise this
Option) fails to pay for and accept delivery of all of the shares specified in
such notice upon tender of delivery thereof, his right to exercise this Option
with respect to such shares not paid for may be terminated by the Company.

     The Committee may, in its discretion at the time of exercise of the Option,
grant to the Optionee a new option (a "Reload Option") to permit the Optionee to
purchase that number of shares of Stock delivered by the Optionee to the Company
in full or partial payment of the option price, on such terms and conditions as
the Committee may determine under the terms of the Plan. The option price for
shares subject to a Reload Option shall be not less than one hundred percent
(100%) of the fair market value of the shares on the date of grant of the Reload
Option, and the duration of a Reload Option shall be equal to the unexpired term
of the exercised Option on the date of exercise.

     5. NON-ASSIGNABILITY OF OPTION. This Option shall not be assignable or
transferable by the Optionee except by will or by the laws of descent and
distribution. During the life of the Optionee, this Option shall be exercisable
only by him, or by a conservator or guardian duly appointed for him by reason of
his incapacity, or by the person appointed by the Optionee in a Durable Power of
Attorney acceptable to the Company's counsel.

     6. COMPLIANCE WITH SECURITIES ACT; LOCK-UP AGREEMENT. The Company shall not
be obligated to sell or issue any shares of Stock or other securities pursuant
to the exercise of this Option unless the shares of Stock or other securities
with respect to which this Option is being exercised are at that time
effectively registered or exempt from registration under the Securities Act of
1933, as amended, and applicable state securities laws. In the event shares or
other securities shall be issued which shall not be so registered, the Optionee
hereby represents, warrants and agrees that he will receive such shares or other
securities for investment and not with a view to their resale or distribution,
and will execute an appropriate investment letter satisfactory to the Company
and its counsel. The Optionee further hereby agrees that as a condition
precedent to the purchase of shares upon exercise of this Option, he will
execute an agreement in a form acceptable to the Company to the effect that the
shares shall be subject to any underwriter's lock-up agreement in connection
with a public offering of any securities of the Company that may from time to
time apply to shares held by officers and employees of the Company, and such
agreement or a successor agreement must be in full force and effect.

     7. LEGENDS. The Optionee hereby acknowledges that the stock certificate or
certificates evidencing shares of Stock or other securities issued pursuant to
any exercise of this Option will bear a legend setting forth the restrictions on
their transferability described in Section 6 hereof.

     8. RIGHTS AS STOCKHOLDER. The Optionee shall have no rights as a
stockholder with respect to any shares covered by this Option until the date of
issuance of a stock certificate to him for such shares. No adjustment shall be
made for dividends or other rights for which the record date is prior to the
date such stock certificate is issued.

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     9. TERMINATION OR AMENDMENT OF PLAN. The Board may terminate or amend the
Plan at any time. No such termination or amendment will affect rights and
obligations under this Option, to the extent it is then in effect and
unexercised.

     10. EFFECT UPON EMPLOYMENT. Nothing in this Option or the Plan shall be
construed to impose any obligation upon the Company to retain the Optionee in
its employ.

     11. TIME FOR ACCEPTANCE. Unless the Optionee shall evidence his acceptance
of this Option by execution of this Agreement within thirty (30) days after its
delivery to him, the Option and this Agreement shall be null and void.

     12. RIGHT OF REPAYMENT. In the event that he accepts employment with a
competitor of the Company within two (2) years after the date of exercise of
this Option or any portion of it, the Optionee shall pay to the Company an
amount equal to the excess of the fair market value of the shares as to which
the Option was exercised on that date, over the price paid for such shares;
provided, however, that the Committee in its discretion may release the Optionee
from the requirement to make such payment, if the Committee determines that the
Optionee's acceptance of such employment is not inimical to the best interests
of the Company. The Company may deduct from any compensation or other amount
payable by the Company to the Optionee the amount of payment due under the
preceding sentence. For purposes of this Section 12, the term "Company" refers
to the Company and all Subsidiaries.

     13. GENERAL PROVISIONS.

          (a)  AMENDMENT; WAIVERS. This Agreement, including the Plan, contains
     the full and complete understanding and agreement of the parties hereto as
     to the subject matter hereof, and except as otherwise permitted by the
     express terms of the Plan and this Agreement, it may not be modified or
     amended, nor may any provision hereof be waived, without a further written
     agreement duly signed by each of the parties; provided, however, that a
     modification or amendment that does not materially diminish the rights of
     the Optionee hereunder, as they may exist immediately before the effective
     date of the modification or amendment, shall be effective upon written
     notice of its provisions to the Optionee. The waiver by either of the
     parties hereto of any provision hereof in any instance shall not operate as
     a waiver of any other provision hereof or in any other instance.

          (b)  BINDING EFFECT. This Agreement shall inure to the benefit of and
     be binding upon the parties hereto and their respective heirs, executors,
     administrators, representatives, successors and assigns.

          (c)  GOVERNING LAW. This Agreement shall be governed by and construed
     in accordance with the laws of the Commonwealth of Massachusetts.

          (d)  CONSTRUCTION. This Agreement is to be construed in accordance
     with the terms of the Plan. In case of any conflict between the Plan and
     this Agreement, the Plan shall control. The titles of the sections of this
     Agreement and of the Plan are included for convenience only and shall not
     be construed as modifying or affecting their provisions.

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     The masculine gender shall include both sexes; the singular shall include
     the plural and the plural the singular unless the context otherwise
     requires.

          (e)  NOTICES. Any notice in connection with this Agreement shall be
     deemed to have been properly delivered if it is in writing and is delivered
     in hand or by facsimile or sent by registered mail, postage prepaid, to the
     party addressed as follows, unless another address has been substituted by
     notice so given:

     To the Optionee:      To his address as set forth on the signature page
                           hereof.

     To the Company:       Iron Mountain Incorporated
                           745 Atlantic Avenue
                           Boston, Massachusetts 02111
                                Attn: Chief Financial Officer

     Copy to:              Sullivan & Worcester LLP
                           One Post Office Square
                           Boston, Massachusetts 02109
                                Attn: David A. Guadagnoli, Esq.

     IN WITNESS WHEREOF, the Company has caused this Agreement to be executed by
its officer thereunto duly authorized, and its corporate seal to be affixed as
of the date set forth below.

Date of grant:[[Month]][[Day]], 199[[yr]]

                                                IRON MOUNTAIN INCORPORATED

                                                By:
                                                   ---------------------------
                                                   Title:
                                                         ---------------------

(Corporate Seal)

Attest:

------------------------
     Secretary

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<Page>

                                                     Grant No.:[[Grantno]]

                               A C C E P T A N C E

     I hereby accept the foregoing Option in accordance with its terms and
conditions and in accordance with the terms and conditions of the Iron Mountain
Incorporated 1995 Stock Incentive Plan.

----------------------                  ----------------------------------
Date                                         (Signature of[[FullName]])

Notice Address:

-----------------

-----------------

-----------------

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                  EXHIBIT 1 to Incentive Stock Option Agreement

Iron Mountain Incorporated
745 Atlantic Avenue
Boston, Massachusetts 02111

RE:  EXERCISE OF INCENTIVE STOCK OPTION UNDER IRON MOUNTAIN INCORPORATED 1995
     STOCK INCENTIVE PLAN

Gentlemen:

     Please take notice that the undersigned hereby elects to exercise the stock
option granted to [[FullName]] on [[Month]] [[Day]], 199[[yr]] by and to the
extent of purchasing _______shares of the Common Stock of Iron Mountain
Incorporated, for the option price of [[Price]] per share, subject to the terms
and conditions of the Incentive Stock Option Agreement between [[FullName]] and
Iron Mountain Incorporated dated as of [[Month]] [[Day]], 199[[yr]] (the
"Agreement").

     The undersigned encloses herewith payment, in cash or in such other
property as is permitted under the Plan, of the purchase price for said shares.
IF THE UNDERSIGNED IS MAKING PAYMENT OF ANY PART OF THE PURCHASE PRICE BY
DELIVERY OF SHARES OF STOCK OF IRON MOUNTAIN INCORPORATED, HE HEREBY CONFIRMS
THAT HE HAS INVESTIGATED AND CONSIDERED THE POSSIBLE INCOME TAX CONSEQUENCES TO
HIM OF MAKING SUCH PAYMENTS IN THAT FORM.

     The undersigned hereby agrees to execute any securities lock-up agreement
currently in effect between one or more underwriters and shareholders of the
Company who are officers or employees of the Company or its Subsidiary, and any
successor to that agreement, with regard to the shares acquired upon this
exercise of a stock option granted under the Plan.

     The undersigned hereby specifically confirms to Iron Mountain Incorporated
that he is acquiring the shares for investment and not with a view to their sale
or distribution, and that the shares shall be held subject to all of the terms
and conditions of the Agreement.

                                          Very truly yours,

--------------------------                --------------------------------
Date                                      (Signed by[[FullName]]
                                          or other party duly exercising option)

                                      - 7 -<Page>

                                                                   EXHIBIT 10.11

                           IRON MOUNTAIN INCORPORATED
              IRON MOUNTAIN INCORPORATED 1995 STOCK INCENTIVE PLAN
                      NON-QUALIFIED STOCK OPTION AGREEMENT

     This Non-Qualified Stock Option Agreement and the attached Non-Qualified
Stock Option Schedule (together, the "Option Agreement") made as of the "Date of
Grant" on the attached Non-Qualified Stock Option Schedule (the "Schedule") by
and between Iron Mountain Incorporated, a Delaware corporation (the "Company"),
and the Optionee.

                                WITNESSETH THAT:

     WHEREAS, the Company has instituted the "Iron Mountain Incorporated 1995
Stock Incentive Plan," as amended (the "Plan"); and

     WHEREAS, the Stock Incentive Plan Subcommittee of the Compensation
Committee (the "Subcommittee") has authorized the grant of a stock option upon
the terms and conditions set forth below and pursuant to the Plan, a copy of
which is attached hereto and incorporated herein; and

     WHEREAS, the Subcommittee has designated this stock option a non-qualified
option in accordance with Section 5 of the Plan;

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
and agreements herein contained and for other good and valuable consideration
the receipt and adequacy of which are hereby acknowledged, the Company and the
Optionee agree as follows.

     1. GRANT. Subject to the terms of the Plan and this Option Agreement, the
Company hereby grants to the Optionee a stock option (the "Option") to purchase
from the Company the amount of Common Stock ("Stock") shown as the "Total Number
of Shares" on the Schedule. This Option is not intended to be an incentive stock
option or to qualify for special federal income tax treatment under Section 422
of the Code.

     2. EXERCISE PRICE. This Option may be exercised at the "Exercise Price Per
Share" shown on the Schedule, subject to adjustment as provided herein and in
the Plan.

     3. TERM AND EXERCISABILITY OF OPTION. Unless sooner terminated pursuant to
the Plan or this Section 3, this Option shall expire on the last day of the
exercise period shown on the Schedule. This Option may be exercised to the
extent vested, as shown on the Schedule, provided that:

          (a)  at the time of exercise the Optionee is not in violation of any
     Employee Confidentiality and Non-Competition Agreement with the Company;

          (b)  the Optionee's employment, contractual or other service
     relationship with the Company ("Relationship") must be in effect on a given
     date in order for any scheduled increment in vesting, as set forth in the
     "Vesting Schedule" on the Schedule, to become effective; and

<Page>

          (c)  this Option may not be exercised after the sixtieth (60th) day
     following the date of termination of the Relationship between the Optionee
     and the Company, except that if the Relationship terminates by reason of
     the Optionee's death or total and permanent disability (as determined by
     the Board on the basis of medical advice satisfactory to it), the
     unexercised portion of the option that is otherwise exercisable on the date
     of termination of the Relationship shall remain exercisable thereafter for
     one (1) year.

For purposes of this Section 3, the term "Company" refers to the Company and all
Subsidiaries.

     4. METHOD OF EXERCISE. Prior to its expiration and to the extent that the
right to purchase shares of Stock has vested hereunder, this Option may be
exercised from time to time by notice acceptable to the Company stating the
number of shares with respect to which this Option is being exercised and
accompanied by either (a) payment in full of the Exercise Price for the number
of shares to be delivered, by means of payment acceptable to the Company in
accordance with Section 5(c) of the Plan, or (b) a description of a "cashless
exercise" procedure and such other documents and undertakings as are necessary
to satisfy that procedure. The Company, or the Committee, may from time to time
designate one or more forms or methods of providing notice of the exercise of an
Option and in that event the Optionee agrees to utilize such form or method. As
soon as practicable after its receipt of such notice, the Company shall, without
transfer or issue tax to the Optionee (or other person entitled to exercise this
Option), deliver to the Optionee (or other person entitled to exercise this
Option), at the principal executive offices of the Company or such other place
as shall be mutually acceptable, a stock certificate or certificates for such
shares out of theretofore authorized but unissued shares or reacquired shares of
its Stock as the Company may elect; provided, however, that the time of such
delivery may be postponed by the Company for such period as may be required for
it with reasonable diligence to comply with any applicable requirements of law.
Payment of the Exercise Price may be made in cash or cash equivalents or, in
accordance with the terms and conditions of Section 5(c) of the Plan, in whole
or in part in shares of Stock of the Company; provided, however, that the Board
reserves the right upon receipt of any written notice of exercise from the
Optionee to require payment in cash with respect to the shares contemplated in
such notice; and provided, further, that the Optionee may not make payment in
shares of Stock that he acquired upon the earlier exercise of any incentive
stock option, unless he has held the shares until at least two (2) years after
the date the incentive stock option was granted and at least one (1) year after
the date the incentive stock option was exercised. If the Optionee (or other
person entitled to exercise this Option) fails to pay for and accept delivery of
all of the shares specified in such notice upon tender of delivery thereof, his
right to exercise this Option with respect to such shares not paid for may be
terminated by the Company.

     The Committee may, in its discretion at the time of exercise of the Option,
grant to the Optionee a new option (a "Reload Option") to permit the Optionee to
purchase that number of shares of Stock delivered by the Optionee to the Company
in full or partial payment of the Exercise Price, or in full or partial payment
of the tax withholding obligations incurred on account of the exercise of the
Option, on such terms and conditions as the Committee may determine under the
terms of the Plan. The Exercise Price for shares subject to a Reload Option
shall be not less than one hundred percent (100%) of the Fair Market Value of
the shares on the

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date of grant of the Reload Option, and the duration of a Reload Option shall be
equal to the unexpired term of the exercised Option on the date of exercise.

     5. WITHHOLDING TAXES. The Optionee hereby agrees, as a condition to any
exercise of this Option, to provide to the Company an amount sufficient to
satisfy the Company's obligation to withhold certain federal, state and local
taxes arising by reason of such exercise (the "Withholding Amount"), if any, by
(a) authorizing the Company and/or any Subsidiary to withhold the Withholding
Amount from his cash compensation or (b) remitting the Withholding Amount to the
Company in cash; provided, however, that to the extent that the Withholding
Amount is not provided by one or a combination of such methods, the Company may
at its election withhold from the Stock that would otherwise be delivered upon
exercise of this Option that number of shares having a Fair Market Value on the
date of exercise sufficient to eliminate any deficiency in the Withholding
Amount.

     6. NON-ASSIGNABILITY OF OPTION. This Option shall not be assignable or
transferable by the Optionee except by will or by the laws of descent and
distribution. During the life of the Optionee, this Option shall be exercisable
only by him, by a conservator or guardian duly appointed for him by reason of
the Optionee's incapacity or by the person appointed by the Optionee in a
durable power of attorney acceptable to the Company's counsel.

     7. COMPLIANCE WITH SECURITIES ACT; LOCK-UP AGREEMENT. The Company shall not
be obligated to sell or issue any shares of Stock or other securities pursuant
to the exercise of this Option unless the shares of Stock or other securities
with respect to which this Option is being exercised are at that time
effectively registered or exempt from registration under the Securities Act and
applicable state securities laws. In the event shares or other securities shall
be issued that shall not be so registered, the Optionee hereby represents,
warrants and agrees that he will receive such shares or other securities for
investment and not with a view to their resale or distribution, and will execute
an appropriate investment letter satisfactory to the Company and its counsel.
The Optionee further hereby agrees that as a condition to the purchase of shares
upon exercise of this Option, he will execute an agreement in a form acceptable
to the Company to the effect that the shares shall be subject to any
underwriter's lock-up agreement in connection with a public offering of any
securities of the Company that may from time to time apply to shares held by
officers and employees of the Company, and such agreement or a successor
agreement must be in full force and effect.

     8. LEGENDS. The Optionee hereby acknowledges that the stock certificate or
certificates evidencing shares of Stock or other securities issued pursuant to
any exercise of this Option may bear a legend setting forth the restrictions on
their transferability described in Section 7 hereof, if such restrictions are
then in effect.

     9. RIGHTS AS STOCKHOLDER. The Optionee shall have no rights as a
stockholder with respect to any shares covered by this Option until the date of
issuance of a stock certificate to him for such shares. No adjustment shall be
made for dividends or other rights for which the record date is prior to the
date such stock certificate is issued.

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<Page>

     10. TERMINATION OR AMENDMENT OF PLAN. The Board may terminate or amend the
Plan at any time. No such termination or amendment will affect rights and
obligations under this Option to the extent it is then in effect and
unexercised.

     11. EFFECT UPON EMPLOYMENT AND PERFORMANCE OF SERVICES. Nothing in this
Option or the Plan shall be construed to impose any obligation upon the Company
or any Subsidiary to employ or utilize the services of the Optionee or to retain
the Optionee in its employ or to engage or retain the services of the Optionee.

     12. TIME FOR ACCEPTANCE. Unless the Optionee shall evidence his acceptance
of this Option by execution of the Schedule within thirty (30) days after its
delivery to him, the Option shall be null and void.

     13. RIGHT OF REPAYMENT. In the event that the Optionee accepts employment
with or provides services for a competitor of the Company within two (2) years
after the date of exercise of this Option or any portion of it, the Optionee
shall pay to the Company an amount equal to the excess of the Fair Market Value
of the Stock as of the date of exercise over the price paid for such shares;
provided, however, that the Committee in its discretion may release the Optionee
from the requirement to make such payment, if the Committee determines that the
Optionee's acceptance of such employment or performance of such services is not
inimical to the best interests of the Company. The Company may deduct the amount
of payment due under the preceding sentence from any compensation or other
amount payable by the Company to the Optionee. For purposes of this Section 13,
the term "Company" refers to the Company and all Subsidiaries.

     14. GENERAL PROVISIONS.

          (a)  AMENDMENT; WAIVERS. This Option Agreement, including the Plan,
     contains the full and complete understanding and agreement of the parties
     hereto as to the subject matter hereof, and except as otherwise permitted
     by the express terms of the Plan and this Option Agreement, it may not be
     modified or amended nor may any provision hereof be waived without a
     further written agreement duly signed by each of the parties; provided,
     however, that a modification or amendment that does not materially diminish
     the rights of the Optionee hereunder, as they may exist immediately before
     the effective date of the modification or amendment, shall be effective
     upon written notice of its provisions to the Optionee. The waiver by either
     of the parties hereto of any provision hereof in any instance shall not
     operate as a waiver of any other provision hereof or in any other instance.

          (b)  BINDING EFFECT. This Option Agreement shall inure to the benefit
     of and be binding upon the parties hereto and their respective heirs,
     executors, administrators, representatives, successors and assigns.

          (c)  GOVERNING LAW. This Option Agreement shall be governed by and
     construed in accordance with the laws of the Commonwealth of Massachusetts,
     without regard to the principles of conflicts of law.

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<Page>

          (d)  CONSTRUCTION. This Option Agreement is to be construed in
     accordance with the terms of the Plan. In case of any conflict between the
     Plan and this Option Agreement, the Plan shall control. The titles of the
     sections of this Option Agreement and of the Plan are included for
     convenience only and shall not be construed as modifying or affecting their
     provisions. The masculine gender shall include both sexes; the singular
     shall include the plural and the plural the singular unless the context
     otherwise requires. Capitalized terms not defined herein shall have the
     meanings given to them in the Plan.

          (e)  NOTICES. Any notice in connection with this Option Agreement
     shall be deemed to have been properly delivered if it is in writing and is
     delivered by hand or facsimile or sent by registered mail, postage prepaid,
     to the party addressed as follows, unless another address has been
     substituted by notice so given:

          To the Optionee:           To his address as set forth on the Schedule

           To the Company:           Iron Mountain Incorporated
                                     745 Atlantic Avenue
                                     Boston, Massachusetts 02111
                                     Attn: Chief Financial Officer

           Copy to:                  Sullivan & Worcester LLP
                                     One Post Office Square
                                     Boston, Massachusetts 02109
                                     Attn: David A. Guadagnoli, Esq.

          (f)  VERSION NUMBER. This document is Version 1 of the Non-Qualified
     Stock Option Agreement.

     IN WITNESS WHEREOF, the Company has caused this Option Agreement to be
issued as of the date set forth in the Schedule.

                                                IRON MOUNTAIN INCORPORATED

                                                --------------------------

                                      - 5 -

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