WowAce

 On the 17th I lost all my data from rarity out of the blue. I had created a horde character and leveled it up to 120. After briefly logging in that morning, then turning my computer off due to a scheduled power outage, when logging back on later that day I discovered that I had lost all of my kill/attempts data. I had tried everything to get it back even resorting to system restores but to no avail. Now this morning I cannot use rarity at all since hovering over the minimap icon does absolutely nothing. Please help.

Did you shut down your computer after WoW successfully closed? Sounds like maybe the game shut down before the data actually updated and saved possibly.

I shut it down the way I always do, using the shut down button on start. That closes everything before switching off, and even if that was that was the case which is isn't, I still don't see why all of my data from before then, was lost.

This happened to me before with Mobinfo about ten years ago. Try going into the Saved Variables folder and see if there is a .bak file for the data. It should say Rarity.lua.bak. If that file is larger than your Rarity.lua file, then try deleting the Rarity.lua and renaming Rarity.lua.bak to Rarity.lua. This might be recover some of your data from before.

Any addon's database is saved when the WOW client is closed normally, and it can indeed be lost if an unexpected shutdown occurs (e.g., ALT+F4, system crash, AppHang+Task Manager shutdown, etc). When using Windows' shutdown button it attempts to terminate any and all applications gracefully, which would theoretically avoid this problem.

If you don't have a regular backup (you really should), there could still be a .bak file as Toddcraft has mentioned. Otherwise, there isn't anything I can do to assist, sorry.

The second problem has been reported elsewhere and it's unrelated. I'll look into it next.