All testing so far indicates that the currently released version of QRecall (1.2.3) is fully functional in Yosemite. I’ve been running QRecall on Yosemite since the first developer release, and have only seen a couple of small cosmetic issues. Testing has included normal day-to-day capture operations, as well as full restores of a bootable Yosemite system.
If anyone reports any Yosemite related bugs, I’ll release a patch. But so far, no one has.