Nextcloud Backup - unable to fetch app data / restoring points

Hello dear community,

I am trying to backup a Nextcloud instance to another offsite using the new backup app. Every time I open Backup in the settings I get two error messages:

unable to fetch app data
unable to fetch restoring points

Accordingly, no restoring points are displayed and no data was loaded to the offsite Nextcloud. The Nextcloud log is empty, no errors are displayed there.

My server:
Ununtu Server 21.04 64 bit for Raspberry
Apache2
PHP8
Redis Cache
Nextcloud 23

Does anyone have any idea what this error could be due to?

Since this app is in development, I’d check the bug tracker and ask there: