James Bucanek wrote:I can't think of any reason why QRecall should interfere with Time Machine. The error associated with QRecall's Preferences folder is especially mysterious, since there's nothing special about that directory at all. In fact, unless you edit an action or an archive is moved, the contents of that directory don't change.
That's pretty much what I thought. And no, I was not editing an action at the time. The QRecall app wasn't even running.
Maybe Apple updated Time Machine to stop working if QRecall is installed.

I'm beginning to think so...
I suspect that something else went wrong. I have no ideal what error 11 is, and suspect you'll never find out as Apple doesn't publish any Time Machine error code specifics. There's a couple of threads on Apple's discussion forum where people have reported failed Time Machine backups with error -43, but they don't appear to have garnered any response from Apple.
Yeah, I did some searches on that myself and didn't turn up anything useful.
The general consensus of these threads seems to be that "Time Machine is great, just make sure you have a second backup strategy."

I have to agree. I've had several cases where Time Machine has claimed various mysterious errors and sometimes I've had to delete the Time Machine backup files and start from scratch to get it running again. I have not had any problems like that with QRecall