I would like to know if people are using full with incremental backup and if if its work correctly because mine doesn't appear to be able to correctly identify changed files during
the incremental/differential backup.

EX:

30 x virtual tapes of 5GB with option write only once enable and 1 week retention

first full backup use 104GB so tape 1 to 22 ( approx. 110GB ) at 12:44 = Succesfull



next programmed backup(differential) 23:00 same day with 8 tapes available ( 23 to 30 ) so approx 40GB = failed ( missing space)

I perfectly know that my data never changed for over 40GB ( not even 10GB ) and I'm facing this problem since day one, I tried with 3 tapes of 40GB , 1 tape of 160GB with write only once disable and its really look like open-e thinking that all my data changed since last backup because when I got 2 consecutive backup they are exactly the same size so open-e doesn't flag my files correctly in the backup db.