What may be confusing - the behavior is slightly different in Backup for Windows (and most help articles are based on the Windows version).
Backup for Linux counts only Full versions in retention by number of versions.
Backup for Windows counts all versions in retention by number of versions (it only deletes the whole chain when it can delete the last version in the chain).
We found this an unnecessary complication and implemented the idea in a simpler and more logical way
So say I have a daily backup setup, 1 full and 6 block levels a week, what would I have to set this to in Windows to keep 3 fulls? 14 versions? Or 20 versions? Or would they accomplish the same thing if all backups ran according to schedule?
This is exactly why it's implemented in a different way in Backup for Linux.
I had assumed that was the way it was supposed to work across the board — Matt J