Online backup provider Mozy.com offers 2GB of free storage to the home user.
You can use their encryption key — which means it's recoverable: they have a backdoor if you
loose lose it, or if someone else turns up with a subpoena — or you can grow your own.
I chose the latter. Which produced this great warning pop-up:
I understand that if I ever lose this key, that neither I nor MozyHome will be able to decrypt my data and I will be hosed.
I clicked “yes”.
(Only later did I find out that Mozy will only backup files resident on a fixed disk. I wanted to back up my USB drive. Oh well. At least I got a laugh.)