Increments should be relative to the last full backup, not to the previous increment
Now, Plesk performs a multi-level incremental backup because it increases restore times, for example if you schedule a full backup every week, you will have
day 0 - full backup
day 1 - first increment (diff with day 0)
day 2 - second increment (diff with day 1)
...
day 6 - last increment (diff with day 6)
Increments should be relative to the last full backup:
day 0 - full backup
day 1 - first increment (diff with day 0)
day 2 - second increment (diff with day 0)
...
day 6 - last increment (diff with day 0)
Marco Marsala
shared this idea
The described concept is a differential backup, which is different from the concept of incremental backup applied in Plesk.
Current incremental backup works exactly as intended, minimizing volume of backup if no changes performed between two increments. We don’t intend to change it now