Disk to Disk to Tape backup in Backup Exec

Notice: It seems that D2D2T feature in Backup Exec 11d is buggy. D2D2T duplicate jobs (which transfer data from disk to tape) are insanely slow and nobody has yet solved this problem. You can try to implement backup of raw Backup to Disk Folder, but it is associated with number of  difficulties when restoring. Files from Backup to Disk Folders are media and they conflict with media which is currently used for backup.

Typical backup solution in most organizations consists of backup server and tape drive/autoloader/tape library connected directly to backup server. Every night backups are pushed to tape through backup server. But sometimes it is more complicated. We have NetApp filer with StorageTek tape library connected to the filer. Backup server sends NDMP commands to the filer and filer in its turn performs actual data transfer to tapes from disk shelves. Most of our hosts are VMware virtual machines. We backup whole .vmdk files, but we also want to perform file-level backups from some of virtual machines. To accomplish that we set up backup agents on all virtual machines, but we can’t backup files directly to tapes, because they do not originate from NetApp filer volumes. So we decided to implement D2D2T multistage backup. The idea here is to create a CIFS share on the filer, backup data there and then transfer data from CIFS share to tapes.

First step here is to configure disk to disk backup. Backup Exec stores disk to disk backups in binary files. Folder where files are stored is listed on Devices tab and files are listed on Media tab. Initially, you need to create a Backup to Disk Folder in Devices tab. There you choose size for backup-to-disk files and maximum number of backups per backup-to-disk file. If backup is larger than file size, it is splitted in several files. If file size is smaller than backup, several backups will be written to one file. I use defaults with 16GB file size. Then you create backup jobs as usual (by configuring selection list and policy) using Backup to Disk Folder as target device.

As a second step you need to instruct Backup Exec to transfer backed up files to tape, upon disk to disk job completion. Backup Exec has “duplicate jobs” to implement that. Go to your backup policy properties, click “New Template”, choose “Duplicate Backup Sets Template”, pick template for which you want to create duplicate, in “Devices and Media” choose your tape library, in “Schedule” choose “Run only according to rules for this template”. This will create duplicate template and rule which will start duplicate job after main job completes. As a result you will have duplicate data on disk and on tape.


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