For one database the backup time is growing. The full backup is made every day at 22.00. During the weekend it takes about 26 minute and it is slowly growing to 284 minutes on Friday. And than on a Saturday it takes 27 minutes again and so on.
The backup of the BI file takes about a few seconds. But the backup of the data files takes more and more time. The number of GB to backup stays the same (about 96 GB).
I have no clue what could cause this behavior.