I'm about 95% certain that I had aCar installed on the SD card under Android 5. I know, not supposed to, certain things won't work, blah, blah blah. Unless you had explicitly set the flags preventing me from making my own decisions about where the app was installed I was running it on the SD card. I don't recall aCar being one of those.
I do know that when I popped a new card in and adopted it as internal storage, aCar was no longer installed. I was also unable to locate the backups on the old SD card since the application folders are encrypted. However all my data and backups until Saturday were there on my phone on Monday morning (I put the new card in Sunday) and I have no idea how they got there.
In any case, it sounds like at some point in the future there is going to be some sort of migration or something that will give us cloud backups, so my original suggestion is going to be taken care of by that.
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