Place new backup functions in a panel

In !980 (merged), some big new options for backups are added. The tab for backups has become huge and I think a lot of user won't change any of the setting. Shall we put these settings in a panel This is it now: I would propose to put it in a "panel" like this:

cc @ram

changed title from Place new backup functions in folding box to Place new backup functions in a panel

changed the description

mentioned in merge request !1115 (merged)

added Feature Request label

closed via merge request !1115 (merged)

mentioned in commit 47a687d7

added Implemented label

changed milestone to %3.2