* You shouldn't have to think about backup. Backup should be set up once, and then work automatically.
* Your files should be encrypted. Your backup files should be encrypted and stored in a secure, remote location that's only accessible to you — from anywhere.
* Your backups should be smart. Your backup system should be smart enough to only back up data that's not already been backed up, only back up parts of a file that have changed, and be able to back up open and locked files.
I'm trying out this service. It's free up to 2G, and only $4.95 a month for unlimited. Sounds too good to be true. I'll be sure to post my experiences with it.
Mozy Online Backup: Simple, Automatic, Secure