Time Machine not resolving on a previously used External Drive (Resolved)

Not Often but I post on a resolved problem that might help.
Please be aware that this involves using a root session that might be dangerous for your data if you don't know what you're doing.
Problem: I had a Time machine dedicated drive that TM wouldn't recognize anymore and would try to do a brand new backup. This led to lack of space (kind of obvious).
As I didn't want to loose history, I tried to "repair" it.
The solution has been
Login as Root
Clean up all files contained in the newly created TM backup folder
Transfer all the content of the "old" backup folder in the Backup.backups to the new one just created by TM.
Logout and login as my std session
Ctrl click TM and backup now.
The problem was probably due to a drive name change that led TM to loose some link, so I did first revert to the original drive name.

This was just to help

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