If you are using Time Machine, you can go to the last restore point set on your last Backup. Otherwise, your Mac is also making restore points of each change by default. You can unlock those restore points if they aren’t already and restore a note via the TextEdit menubar. Here is how: open the note file with TextEdit (right-click, then “Open With”) , make a minor change and save it. Now you can click on “File -> Revert To -> Browse All Versions…” in the TextEdit menubar and all restore points should be loaded now.
Step by step:
1) Open the note in TextEdit:
2) Edit the note once:
3) Open the restore menu in TextEdit:
4) Browse and restore the note: