I have implemented backup commenting using the second method mentioned above.. if someone is interested..
* Comment field added for manual backups
* Comment by cron backups are set as “Cron backup at [date/time]”
A few other changes as well:
* “gzip” is now enabled as default
* in the manager, the buttons (“download”, “delete”, “restore”) also is above the list of backups
* when a manual backup has been made, a redirection is made to the “manage” page
As mentioned in the stylesheet-thread, the admin-interface now uses “database-admin-css.css” if it exists.