In our environment we have a windows 2012 storage server from which SAN disk were mapped and configured CIFS share to all the users. so the size of the file server full backup is around 3 TB which consist of N number of files and folders. But to complete a full backup it takes nearly 30 hrs. I need a suggestion to optimize the backup to reduce the backup window. We prefer Backup to tape so BBB backup is also not possible for our environment.