Architecture

Radarr, Sonarr, Prowlarr, Profilarr, Bazarr, Tdarr, SABnzbd, NZBGet, Tautulli, Jellyfin, Emby, Plex, and Seerr each feed Backuparr; Backuparr uploads each backup via rclone to Local storage, Google Drive, Microsoft OneDrive, and Dropbox

Why not reuse an existing tool?

Zerka30/servarr-backup does this for Radarr/Sonarr/Prowlarr to S3. Backuparr covers more apps and sends backups through rclone to Local storage, Google Drive (connected in the UI), and OneDrive or Dropbox (a one-time rclone authorize paste) - no rclone config wizard needed.