CrashPlan offers its CrashPlan+ Unlimited Backup 1-Year Subscription for free
. That's $50 off and tied with our September mention as the best deal we've ever seen from CrashPlan. CrashPlan offers real-time backup of your files, even from attached drives, and features version retention, web restore, and more.
Of note, while this deal states that it's for Carbonite members wishing to switch, any e-mail address will work.