Much appreciated, and FYI
Backup not showing in Restore has my thoughts on what to do. One part was the manual, which asks for PRs, and it might progress faster if you feel comfortable trying to explain the scheme to non-expert users.
My posts there also dip into why any sort of true-calendar-based scheme might be lots of work to achieve.
Definitely avoids questions like “what’s a month” or "if I use up my slot for this week, when is my next one?