[reggoboy]

Supporting this also means you wouldn't have the ability to choose what name to use for the backup, but some users may not care about that if they just want to overwrite their last file.

The default backup format I'm getting is:

MobileSheetsBackup_2024-06-04.msb

 
so it will only overwrite if you do two in the same day. When we write code like that, we solve it with a timestamp, like:

MobileSheetsBackup_2024-06-04_HH-MM-SS.msb

If you do two backups in the same second, you can probably overwrite the first one :-)

For iOS/MacOS, the last screen where you have to select where to save it will always be required. I won't have write privileges to the output location otherwise (when saving to local file).

I believe you, but I don't understand. It doesn't ask me for permissions; it just asks for a directory. Maybe when I first installed the app it probably prompted me for permissions? If so, doing that one time is expected and no big deal.