Note: You should / must
- back up your projects (AIAs) regularly (download them to the PC) and
- make sure to back up the keystore. The keystore is azzociated with your account (it cannot be restored; not even by the MIT team, unless they can restore your account).
I back up each of my projects (PC & GoogleDrive) about every hour after I've worked on an app:
projectXY_1.aia → projectXY_2.aia → projectXY_3.aia, ...
because I hate to have worked for nothing. 