This seems like a very simple thing... I'm pretty new to linux, so I just don't know how to do it.
I want to rename folders.
The name of the folder might already exist, in which case it needs to replace the contents of that folder... but if that's a problem i can delete the folder prior to renaming the new one.
Backup6 --> Backup7
Backup5 --> Backup6
Backup1 --> Backup2
My Dir --> Backup1 (this one is a copy, not a rename)