In Symantec Backup Exec 2012, Why does my backup run at 3000MB/sec one night, and the next night only run at 50MB/sec??

In Symantec Backup Exec 2012, Why does my backup run at 3000MB/sec one night, and the next night only run at 50MB/sec?? I have other backups running, and this is the only one that does it. It is my file server cluster named "data" running DFS between two virtual servers.
ICantSeeAsked:
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Tyler LapriseCommented:
The reason is probably related with the speed of your wireless/wired connection...
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ICantSeeAuthor Commented:
Why would'nt any of the other backups be affected then? And it wil stay at about 50MB during the entire backup. Then the next backup will begin, and be well over 1000Mb/sec. I dont think the connection speed has anything to do with it. Also the backup is happening from a virtual server to a tape library, within the same server rack.
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noxchoGlobal Support CoordinatorCommented:
Does it take always the same type of backup? If it takes incremental backup then it could run faster because of the fewer data to transfer. And when it takes full backup - the speed can be dropped by network itself due to bigger amount of data transfer.
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ICantSeeAuthor Commented:
This is true "And when it takes full backup - the speed can be dropped by network itself due to bigger amount of data transfer".. This is the case for some of my backups.
I also did notice that a different backup, a SQL server, was doing the same thing.. I found that on the backups that were transferring quicker had a 'backup consistency check' configured, compared to the slower backups. I need to investigate this more. I am closing this question. Thank you for your help.
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