BE2012 7 Robotic tape library - suddenly using a lot more tapes
I have Backup Exec 2012 with and IBM robotic tape library (with 2 x drives)
There are a series of jobs that run overnight backing up various things.
I have had my backup routine reasonably settled for a couple of months now and each night normally 2 tapes have been used, sometimes 3.
Over the last few days this has suddenly changed to 5, 6 even 7 tapes (the amount of data being backed up has not changed dramatically). This is going to start causing me a problem because I have around 50 tapes in total on a 2 week cycle and I am going to run out of tapes.
I have around 8 seperate overnight jobs. It used to be that when one job finished and the next one started, it would use the same tape. Now it seems to use a different tape pretty much with every job.
I did have my jobs set to 'append to media, overwrite if no appendable media is available' so i tried changing this to 'Overwrite media' last night, but this did not seem to make any difference.
How can I reduce down the number of tapes being used to how it was previously?