I think it's also possible to tell Syncthing to sync file adds/updates but not deletes. I wouldn't trust it 100% with my files, though, probably still a good id

I think it's also possible to tell Syncthing to sync file adds/updates but not deletes. I wouldn't trust it 100% with my files, though, probably still a good idea to manually take regular backups to an external hard drive or something.