Thank You for the help.
The article that You mention is related to data recovery, that I believe is the previous version, whereas the customer has data protection.
Anyway the basic concepts might still apply, and in fact I thought that maybe when I remove a backup the space is not completely and fully released, but is marked as free and is made available to be reused for following backup.
BUT, if it is the case, I should NOT see the used capacity that increases everyday.
For example, imagine that I reached 80%.
I remove old backup for say 10%.
So, now there is 70% used, 20% completely free, and 10% that will be reused by data protection again.
I should see that the used capacity stays at 80%, because data protection REuses freed space.
Instead, the used capacity just one day later my removing old backup goes up to 81%, then to 83%, and so on.
Are there commands that let me check these data?
Thank You again and regards
Rodolfo Giovanninetti