Use Local Drive
Save content to the local drive without encryption and allow users to select local drive as backup and restore in case of a disaster. This should avoid the sync issues and allow us to save more current work that has not been synced with the server.
Vidyut Gore commented
There are long documents I create where I can't store on external servers. I need the ability to use local drive exclusively and not backup to your server at all. I don't understand why you need to maintain a copy of my work.