do a bulk export of everything in "Your Data"

I have a bunch of maps, custom sources, and custom icons in "Your Data" (9 maps, a couple dozen custom sources, and several dozen custom icons). And I'm sure I'm not even using this as extensively as others.

It would be nice to do a bulk export so in one operation I can download a backup of all my data, even if it downloads all the KML, KMZ, XML, JSON, whatever files into one big zip file. This would mainly be for backup purposes.

I know how to individually export maps. However, even with the 9 I do have, if I want to backup my data, I have to go through and do the export 9 times - which is cumbersome and time-consuming and means I have to manage 9 different files.

And I don't know of a way to backup custom icons and custom sources (short of just keeping a copy of them myself somewhere).

I'm less worried about backing up the custom sources and custom icons - but if there can be a feature where you can export those in some XML or JSON file, that would be nice, too.

But definitely being able to do a bulk-export of all maps in "Your Data" would go a long way towards usability and would make backing up our data much nicer and easier. I can envision an "Export" button somewhere in the "Your Data" screen, like this in the popup-menu: