NextcloudPI Backups does not work to restore (Unauthorized download)

Hello Guys, my nextcloud works fine, but the backup sizes are in the minus:Annotation 2020-06-10 145306

And when i want to download the backup, i get this error:
Unauthorized download

I checked the path and tried it with another path and another usb device…

I hope you can help me, and sorry for my english i’m from switzerland

Elias

Does the path actually contain backups?

yes sure. i can now make a backup but i can’t download it…

You checked that via ssh terminal, or do you expect that from the info in ncp pannel?
Does www-user have full access to the backup path?