Offsite data backup is a great idea. Fires, thefts, earthquakes, electronic failure -- all kinds of problems that could be incredibly disruptive to your life -- if you do not have a good backup option (in addition to using an external drive with your computer).
Recently this arcane product became big news, as Carbonite dropped its advertizing on the Rush Limbaugh show -- for the "slut" comment. Bad decision by Carbonite, IMHO, though no Limbaugh fan would deny them that option. I'll let others point out the hypocrisy of Carbonite, and the hit they took on their stock.
Ironically, as it turns out, Carbonite is a substandard product to begin with. Compare it to the competition.
My recommendation is that you consider switching to MemoPal. I compared it with Carbonite (well BEFORE the flap), and the choice was clear.
MemoPal is 49 Euros a year (currently that's about $64) for 200 gigs total backup. Carbonite is $59 a year and supposedly unlimited -- but the devil is in the detail.
Many computers can use the single MemoPal license for backup -- unlike Carbonite, which is limited to one computer.
MemoPal offers 3 gigs for free -- unlike Carbonite, which offers only a trial.
MemoPal does incremental backups, easy retrieval and offers other excellent features.
MemoPal is a snap to download and install.
There's currently a discount code BACKUPSR that takes 15% off the price.
Here's MemoPal's (biased but accurate) comparison of its product with Carbonite.
Of course, from the MemoPal website you can check it out in detail, and order if desired. And if unsure, try it out with the free 3 gigs (which is permanent, not a trial). I've used MemoPal for over a year on several computers with flawless performance in every respect.