Support for choosing a custom backup location

Is your feature request related to a problem? Please describe. I have a cloud folder on my android device. I configure some apps to do regular backups into that folder. I would like to do this with AnkiDroid, too, but I don't want to put the main AnkiDroid folder into my cloud folder, since it contains 10k+ (media) files.

Describe the solution you'd like An option for choosing a custom path for the backup folder.

Describe alternatives you've considered Relying on AnkiWeb for backup. Or manually copying the backup files.

Additional context Since AnkiWeb provides some way of backup, it is of less priority. However since local backups are still encouraged (by the AnkiWeb docs/terms), I think it would be a nice option. Also this is only relevant for setups that do not sync to another device regularly (since then that would be an additional form of backup).