I have been using Carbonite as my backup service for 2 years now, but I will not be renewing.
Carbonite has an infuriating feature. To save storage space on their end, they automatically de-select video files from your backup sets. Which means that to backup family videos, you have to manually go and select video files every so often.
I have had enough of this.
My subscription will run out soon, and I will switch to a different service. So far, Mozy and Backblaze look the most promising. Both are unlimited, cheap, and seem to get good reviews.