If you already tried it, I think it’s better to start over with a new local backup volume configuration.
Stop rclone-webdav service:
systemctl stop rclone-webdav
Remove the backup00 volume:
podman volume rm backup00
Follow the steps to create a new local backup from Backup and restore — NS8 documentation
Run the local backup from the UI. I didn’t need to remove or create a new local backup destination.