A while back I wrote an article on iCloud vs Dropbox for iOS music making, explaining how an automatic iCloud backup feature would be nice in that it would save your projects from getting lost forever, if it was integrated into the app. Well as it turns out, it doesn’t have to be. Recently, I reset my iPod touch from the settings app…

Settings > General > Reset > 'Erase All Content and Settings' - Which I'm assuming does the same thing as an iTunes (USB) reset.
The files / projects in the follow apps were still there after restoring my latest iCloud backup:
I was really glad to see that it saved the BeatMaker / NanoStudio / FL Studio files, as studio apps usually the ones I’m constantly backing up via Dropbox / NanoSync / email…
Now these apps don’t have iCloud built in, they’re backed up by iCloud – there’s a difference. Apps with iCloud built in allow you to do stuff like share project files between your iPhone, iPad, and Mac, like GarageBand does. Apps that are backed up by iCloud just get their files backed up incase you lose or break your device, hence them being there after resetting and loading the backup.
Apple only gives you 5 gigabytes of iCloud storage for free, but you can choose what apps are backed up by iCloud by going to Settings > iCloud > Storage & Backup > Manage Storage > select the backup with the caption “This iPod touch/iPhone/iPad” and toggling the apps you want backed up:

For apps that have iCloud built in, like GarageBand, just go to to Settings > iCloud > Storage & Backup > Manage Storage:

From there, you can edit the specific files iCloud has backed up:

Those four apps listed above are the only ones I’ve tested (it takes a while to erase your iPod and re-download all of the apps) so if you know of any more apps that are backed up by iCloud and what it saves, leave a comment below!