I'm looking for an online backup solution simple enough that my father could use, so it needs to be simple, automatic and trustworthy.
My current advice is to use a portable USB drive, but I am now willing to move online to avoid having local data and the manual process of making copies. FTP, rsync and so on are not options here. The software should be easy to use and take care of what folders to backup, how often, transmit only differentials, keep some revisions, etc.
I've seen there are popping out options for online storage backup solutions. What have you tried? Any recommendations? It doesn't need to be free, but a free trial would be nice. Encryption?
I've seen a related question for business. It's related, but aimed at a different scenario.
EDIT:
Answering some questions that arised:
It should run on Windows. We have slow ADSL here, some upload speed is around 128-256kbps (that´s why differentials are important). The information is not CIA-grade sensitive, but I would prefer to have it encrypted, at least on the back-end. If they get hacked,I would not like all my documents open on the wild. No need for multiple computer support.
I guess I will try out Dropbox and Mozy, the current upvoted alternatives and let you know. I'm also tempted to try JungleDisk as the usage of an S3 backend seems elegant. Any other that uses S3?