Automatic backup doesnt work

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Nextcloud version (eg, 20.0.5): 26.0.7
Operating system and version (eg, Ubuntu 20.04): Linux 5.10.103-v8+ aarch64
Apache or nginx version (eg, Apache 2.4.25): mySQL 10.3.39
PHP version (eg, 7.4): 8.2.11

The issue you are facing: Automatic back-up does not work.

Is this the first time you’ve seen this error? (Y/N): I have now tried it for several days, but the BackUp function does not work.

Apps used:

I have screenshot of the GUI as I configured it. The other external hard drive that is to be used as a backup hard drive has been mounted.

I have also triggered the BackUp manually, but unfortunately I get an error message, see screenshot.

I would be very grateful for your help!