Fair enough, you might want to consider using a different provider (dropbox, onedrive, etc.) with E2EE enabled, this way you get get privacy and a more seamless syncing experience.
For the record though, I've been using sync with dropbox (E2EE enabled) through the filesystem for almost 2 years (because it's faster than using the api connection) and I have only had a couple sync issues and none in the last year. This is probably because I do wait to see dropbox has finished syncing, which usually only takes about 2 seconds since I sync regularly.
No matter which tool you use, manual backups are always a good idea so thats also some complexity you might want to consider adding 