Hello,
Do you have a SAN environement? When you say 'devices drop off switches', what exactly happens? Does the device go offline during the backup? If yes, since when does this problem occur?
Kindly elaborate your environement as well as the issue so as to better understand it.
Note : If we do not receive your reply within two business days, this post would be marked ‘assumed answered’ and would be moved to ‘answered questions’ pool.
Regards.