If I select Settings, system, backups I get a spinning wheel for hours, no errors showing.
What can I do?
Have you tried clearing your web browser cache?
Sometimes other backup integrations can save that too.
Try to make sure that they are not in a process of backing up and then stop them from autostarts and restart your system.
It could be a corrupted backup file.
Look in the directory for files named like 5d315b3f.tar and their sizes, it should be coherent with the others if you have many.