I’m in the same boat and hoping their new drive SDK will finally put a lot of these issues to rest. If possible I would love to sync a backup of my photos directly to proton from my immich self hosted instance. If they ever release it of course.

They mentioned “better background backups” as a enhancement as since version 1.141.1 which was released on 9/8/2025. Personally I just started testing it after v2.0 so I’m not sure how bad it was previously but have not seen any significant issues with backup.