I back up all my working data to zip disks every day and send a set of disks to off-site storage once a month. That can be almost anywhere, including a friend's house or a private mailbox. If your house burned down, you wouldn't want your career to also go up in smoke. Plenty of free Internet storage options such as FreeDrive are available nowadays as well. You won't have time to go to a copy center for every little copy job, so spend the money on a simple photocopier that's good for jobs up to 20 pages.
Great options are available today on integrated devices that copy, print, and fax.
Remember that companies such as Kinko's allow electronic document submission, and offer free pick up and delivery for larger jobs. As a consultant, communication is everything, so make yourself readily reachable in a professional manner. A dedicated phone line is a must, and a cell phone is indispensable. My office line automatically forwards to my cell phone after four rings, and I use the cell phone voice mail for all my messages. You would think that faxing would be obsolete in the Internet age, but I find that I constantly have to execute legal documents by fax.