The "data processed" of my daily backup (rev.incr.) increased in size dramatically over the last night.
I added a new VM to the Hyper-V host which is around 600 GB (332 GB used) in size, but the data processed went from 2.7 TB the day before to 6.2 TB this day.
The incremental backup therefore takes around 3 times as long as before.
How is it that the data processed increased this dramatically only because of a new VM that is quite small?
I think I found it: The job was preforming the backup files health check. Therefore it needs to process the whole VM data, not only the "data used". Right?