In Windows 7 or 10, if you are using Windows Explorer, try copying a test file from one folder and pasting into another empty folder. Then go back and do it again. When you click 'paste' the second time you will be offered 3 choices -
(1) Replace destination file (overwrites file that is already there)
(2) Skip copying (copies nothing, leaves alone file that is already there)
(3) Compare both files; you can then replace, skip or rename the newer file with a number
If you already have just
New Text Document.txt, the next time you pasted a file with that same name, in the same folder, it will be pasted as
New Text Document (2).txtTry to paste in same folder, choose 3rd option:
Check both boxes:
Newer file is renamed:
This is how it looks in Windows 10, but Windows 7 is very similar. if you are doing lots of files, they will be renumbered consecutively.