I accidentally overwrote a small text file. I have no selectable TimeMachine snapshots - the "up" buttons are greyed out (note; tried Ctrl + Shift + C to remount but it makes no difference). Which is not surprising, as I have no external drive setup (and cannot because of security reasons).
There are a plethora of bad & free recovery apps that don't seem to work.
I'm wondering if there is any free & simple option available?