.....is it Carbonite that you are thinking of?
Forget Carbonite. If you want to do offsite backup use CrashPlan. Details here
why. It's $60 a year per machine for personal, $120 for business plans. Also CrashPlan is Mac based. The only Windows machines they have are for testing.
I have a local TM backup, and a local SuperDuper for a bootable backup that I run every few days, plus CrashPlan runs 24/7. BTW any offsite backup is a files only backup, not a bare metal recovery backup.