Thanks for the answer : downtime isn’t a problem since I am the only one using the server for now, and I still have leftovers from a previous setup (stremio, local music)

You are absolutely right, I haven’t checked the backups yet, but I will make sure to do it. I was thinking to wipe radarr or sonarr, reinstall the container and restore from their manual backups, to see if everything works. For Immich is probably safer to start from scratch, I don’t have that many photos backed-up anyway and I heard it might not always work.