Undo function

Alex Jenter 13 aastat tagasi uuendaja Happy Song 1 aasta tagasi 5
We can now undo actions like deleting a note only via using the last hourly/daily backup, which is not always good enough. CintaNotes should support the undo function. (http://cintanotes.com/forum/viewtopic.php?f=4&t=450)
editing other complexity:medium
What about "backup now" action?
Can be implemented without any problem, but as a separate request:
If I select like hundred notes and middle-click some tag to remove it from those notes, and then realize I did a mistake, I could not restore that tag.

So this should be possible to be undone as well.