Have been having this issue more and more often - frequently, when I open my (entirely local, no cloud sync or anything) vault on android, one of the first files to be loaded is replaced with the contents of a file that is also open in another tab. Likewise, I am deeply deeply concerned by this, and I hope the response has been deeper than just a few replies in this thread. I have no idea how many files I may have lost from this - and yes, although backup certainly helps, even knowing which files need restoring would involve scanning them for a specific type of change and each individual person would have to do it.