I would suggest removing the Kobo Sage and Kobo Libra H2O items in the device list and the configure options for each device checkmark. At times, that list has lost it's connection to the devices after a firmware update, factory reset, whatever.
For me since the backup includes the device information and I use the same configuration for all them, I don't bother with the device list. However if you want to use it, if after removing the device list and the check mark for configure options for each device, try adding your Sage and Libra H2O back in and see if the database backup functions then.
What I meant by device information in the backup is the filename identifies the device and backup date:
KoboReader-KoboSage-N7abcdefghijk-20240105-123537.zip
KoboReader-KoboForma-N7abcdefghijk-20240103-212754.zip
KoboReader-KoboClaraHD-N2abcdefghijk-20240105-115905.zip
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