What do you mean by ‘desyncing’ issues. I use Syncthing very heavily across my servers and workstations and I don’t have any trouble. I run my own Syncthing relay server for NAT traversal.

This exactly. I’d use rsync to sync a directory to a location to then be backed up by kopia, but I wouldn’t use rsync exclusively for backups.

If you’re playing BotW I’d recommend emulating the Wii U version using Cemu. Performance is way better overall but you’ll still need to enable a 60fps mod.