Download CrashPlan free–no credit card required–and back up to CrashPlan Central free for 30 days.

• 
  Install.

  Double-click the downloaded file and proceed through the installer.

• 
  Create Account.

  Open CrashPlan after the install completes, enter your name, email and password to create a new account.

• 
  Click Start.

  Start backing up to the cloud immediately by clicking Start Backup. No need to adjust any settings right away.