I woke up this morning to some great news in my inbox from Pete Koomen, one of the engineers on the App Engine team who was kindly helping me out with the issues I was having last year and whom I've been liaising with since regarding App Engine:
I'm happy to announce that there's quite an important update to Gaebar that brings with it some essential bug fixes and should help shave quite a bit of time off of your restores.
Update: Beta 2 Released! See the Gaebar Beta 2 announcement.