Copy is a fabulous online backup service. I was recently introduced to it and I like the fact that it gives you 15 GB free on signup (20 GB with referrals) and referral gives both people 5 GB. It is built by a seasoned network company and even have installer for Raspberry Pi (it’s so amazing!!). I’m just waiting for them to come up with a full-fledged Windows RT version so that I could sync my tablet to copy account.
I’ve been a big fan of Dropbox and I’ll still keep using it–I have a 50 GB dropbox account with I got with my Galaxy phone. However I like to experiment. My last experiment was cubby.com and it was a nightmare. Some of the friends I recommend it to have stopped talking to me now (and I blame it on cubby).