First, go to software.fandm.edu (requires NetID authentication) and download CrashPlan. If you are unsure if you have 32 or 64 but Windows, open the start menu, right click on Computer, and click Properties.
Find the crashplan.exe file and run it.
Read the licence agreement and if you agree, select I accept the terms in the License Agreement and click Next
Wait for the install to finish
Enter your First name, Last name, NetID, and your password, then click Create Account.
CrashPlan will now scan your computer and start backing up files. You can close CrashPlan and it will run in the background.
CrashPlan will monitor CPU utilization to make sure that it is not interfering with your work (i.e. it will stay out of your way and you shouldn't notice that it is even there).