There seems to be a similar problem, that has been solved:
https://help.nextcloud.com/t/solved-12-0-2-to-12-0-3-update-failes-at-create-backup/21490
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There seems to be a similar problem, that has been solved:
https://help.nextcloud.com/t/solved-12-0-2-to-12-0-3-update-failes-at-create-backup/21490