I have an external disk of 2TB which is fully loaded with all versions of my backup files, saved by TimeMachine. I want to bring that back to a collection of backup files containing only the latest version of each; all older versions of all 'involved' files (files which have been altered by the system or by me) may be deleted.
It's not a solution to make a new backup of my current system, because the 2TB was produced using OSX El Capitan and I did a clean install of Sierra on the same hardware.
How can I compress the TM backup of 2TB to in fact the size of my previous (El Capitan) system?
Btw, main goal of this all is to save (external) disk space.