I have issue with backup file did not show up in the UI (Settings > System > Backup).
I have created full backup from the UI and when SSH to check in the /backup folder the tar file was created but it won’t show file in the UI.
Then I check the super visor logs found this error.
I cannot extract file and it show file is invalid. Seem like the file corrupted.
After dig into the forum found one post mentioned about MariaBD cause the back up file to get corrupted.
I have tried backup without MariaDB, then everything works.