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mkurtzhals
mkurtzhals asked
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Backup2Disk or Backup to Tape.  We have around 250 gigs of data that we write to tape (FULL!) Backup every night.  I am new on board and going to implement a new system.  We have a Quantum SDLT drive with DLT tapes.  Should i upgrade to the superDLT tapes?  I was thinking on setting up backup2disk and then backup to tape from the disk.  I am open to suggestions and types of euipment needed.  Probably going to go to incremently and just a weekly full.  Not sure about why they run a daily full everyday.

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Lee W, MVPTechnology and Business Process Advisor
Most Valuable Expert 2013

Commented:
I'll try to post back more specifically to your question later, but perhaps this will help you ask other questions - I have a comment on backup I turned into a web page because it got rather long... check out:
http://www.lwcomputing.com/tips/static/backup.asp

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Commented:
Another note is that we run the full  Veritas backup comprised of 15 different servers and most of them backing up entire hardisk.  Would this be a nightmare to restore this way?  I am guessing so.

Author

Commented:
Would I want to maybe run ntbackup to disk then run veritas to tape just to cover my @$$

Commented:
If you don't mind tinkering I would suggest NASBackup for D2D backup.  If you are going to upgrade tape why not go to LTO3?
Distinguished Expert 2019

Commented:
Backup Exec supports Disk to Disk to tape (D2D2T), there's no reason to use ntbackup to disk and then Backup Exec to tape or are you thinking of using ntbackup to a shared UNC path to save buying remote agents?

Author

Commented:
I was more or less going for if my veritas backups were corrupted I would have something to go off
Distinguished Expert 2019
Commented:
Backup Exc an ntbackup are near enough the same product, they can restore from each other's .bkf files (except for system state) because Veritas license the code to MS.

With D2D2T if your disk backups are corrupt you've got the tape backups to fall-back on anyway. If the catalog gets corrupt you just have to wipe it and re-catalog your media.

The advantage of D2D2T over backing up to disk and then backing up to tape is that D2D2T is a copy job so you can restore direct from tape; backing up a backup means you have to restore to disk from tape and then restore from disk to server so two steps instead of one.

Disk backup can be local or on NAS, makes little difference as long as the are similar speeds and you get a dedicated NIC, we've got 14 disk RAID 0 for the staging and then an LTO2 library for the copy to go offsite, one of the only times I would use RAID 0 since if the device fails we've still got the live data and anything that's really critical gets backed up to a remmote NAS as well. Had to use RAID 0, RAID 5 wasn't fast enough to feed the tape drives.

There's something called synthetic backup in BE although you have to buy the advanced disk option (not needed for normal D2D2T) that lets it make one full backup and a series of incrementals on the disks and then merge the full plus incs into a full backup tape. Only does data though, not system state or databases like Exch and SQL.

AFAIK you can only read from DLT with a DLT tape drive, not write to it so I don't think there's any reason to change your media, it must be SDLT already.

Author

Commented:
So the best solution would be a backup 2 NAS then backup that data to tape?  Would you want a nightly backup to tape or weekly if you are doing both.  With 300+ gigs should i start doing daily differentials and a weekly full?  Thanks for your help.

Commented:
In my opinion the best option for you is to backup either to NAS or to FTP server.
Distinguished Expert 2019

Commented:
>So the best solution would be a backup 2 NAS then backup that data to tape?

No, copy (with BE) the disk based backup rather than backing it up again, then it's just 1 stage to restore from tape rather than two steps. Think of it like not zipping up a zip file.

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Commented:
andy-  Thanks for your help.  So if I went with a disk backup what do you recommend for the offsite backup.  Should we run a separate job in veritas straight from server to tape or use the tape to backup the backup to disk.  I was thinking (depending on the speed and space) doing nightly differentials to disk and weekly full to disk then on the weekend running a separate backup to disk.  Does this sound good?