If you'd like to use different accounts, so that each computer (user) is the sole owner of his backed up files, this is also possible. Trying to restore such files from another computer (this is called a guest restore in CrashPlan) will require the user to enter the owner's password.

<p style="color:red">'''NOTE''' The CrashPlan UI sometimes has issues registering button clicks. If you click a button and it seems to do nothing, hit the ENTER key. That seems to help in such cases.</p>