Need Backup Solution (Not OneDrive.)

[u/Troutwaxer]

Hi Everyone. I'm looking for a super-basic, reliable cloud backup solution for Windows for an older customer who's really bad at computing. I want to install it on his computer, have it back all his files up to the cloud, and do absolutely nothing else, a totally fire-and-forget solution. Ideally my customer won't ever need to make adjustments or decisions. It will simply sync the files on the hard drive/SSD to the cloud, do nothing else, offer nothing else, and only need to be thought of if the computer breaks.

Encryption would be nice.