The first time you open the CrashPlan app, you're prompted to create your account. The email and password you enter here will be used for all of the computers you back up with CrashPlan. Your email is also tied to your CrashPlan for Home subscription (if you decide to purchase one).
Creating an account is as easy as entering your name and email, and choosing a password. Once you click Create Account, you're automatically signed in.
Be sure to use an email address that you want linked to your CrashPlan account going forward.
All signed in? Great! Click Next below to learn about what to back up.