Have you found a solution for them yet? I’m working with setting up a school backup for office staff, and I’m using synology (ds218) for their network share drive and backup needs.
The plan (trying out now) is to use hyper backup from synology to backup to google drive (they have service with them), but can easily use office 365 onedrive to store an encrypted vault backup of their nas data.
To protect them from ransomware or corrupt files backed up, it looks like I also have to implement snapshot of data every 3mo’s (i’m thinking). I also have versioning enabled to save the latest version daily of their data. what’s left to figure out is how many versions and when to start overwriting the earliest backup - i think it goes out for 4yrs for their <30G of data on a 1T capacity for online backup.
Still figuring out how far out to have their data backed up and also # of snapshots and frequency kept as well for ransom/corruption restoration purposes…