How do I configure my Backup Strategy using Backup Exec 11D

Posted on 2009-05-01
Medium Priority
Last Modified: 2013-12-01
In my current environment I'm using a Sony LIB-162 which contains an 8 slot AIT Library. I'd like to implement a GrandFather-Father-Son backup strategy. M-Thur I'd like to do Incrementals and on Fridays full backups. I have a total of 20 tapes. I'd like to only have to change out the tapes once a week or every two weeks if possible. If someone could get me going in the right direction as far as how to configure the device pools, and media sets that would be great.
Question by:Mr-Bailey
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Expert Comment

ID: 24281924
20 tapes...

This varies very heavily on the amount of data being backed up. Have you already calculated how many GB of data total will be backed up?

Author Comment

ID: 24282067
Yes I'll be backing up close to 500gb.

Expert Comment

ID: 24282437
errr I forgot to ask what is the native capacity for each tape?
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Author Comment

ID: 24282579
No problem. The capacity is 200gb. Also I just found out that the total amount of data that I will have to back up is around 3.TB. Also the tape drive I have is a Sony AIT Lib-81(8slots) not 162 as initially stated. We do have a AIT Lib-162 (16slots) but it's been sent back to sony for repair.  So all I have now is the Lib-81 & a 2TB snap server to use for backups.

Expert Comment

ID: 24306984
sorry for long wait here. I seem to have more questions every time you provide more answers :P

So that 3 TB total is how much you need to back up for each Full backup?  If so that doesn't give you much room with 20 Tapes @ 4TB total native capacity...or is that 3TB a total amount for say... a months worth of weekly full and daily incremental backups?

Then comes the question--How how far back are you required to go with the tapes? If you only need one month's worth of backups then you might be able to squeeze by.

As for cutting down your tape swapping time... that will be very hard to do with an 8 slot library. With that said, mind if I share a bit about my set up and compare?


Accepted Solution

L3370 earned 1500 total points
ID: 24307238
ok. At my site we have roughly 1TB of data on our servers that needs to be backed up.  We run weekly Full backups on friday, with incrementals done daily Mon-Thurs.  At end of month we do a full backup for archiving purposes as well. All this is done with 100GB native tapes on a 24 tape library.  Tape swaps are done 2-3 times a month.

The library has 2 tape drives, so we have 2 jobs for every backup set--putting half the servers on one job, and half on the other.  We created multiple media sets for each. Here's the breakdown

Media sets--
Mon-Thurs (servergroup A)
Mon-Thurs (servergroup B)

Friday (A)
Friday (b)

Monthly (A)
Monthly (B)

Friday Archive (A)
Friday Archive (B)

Monthly Archive (A)
Monthly Archive (B)

The biggest wildcard here is incremental backups.  I got lucky with ours and was able to squeak by with 1 tape per group on Mon-Thurs (100GB).  I keep this data for a week. So if a customer wants a restore from longer than a week, I'll have to pull from a Friday full backup. Thats as close as I'll get them, and I tell them they shouldn't wait longer than a week to report the problem. That allowed me to never have to change out the Mon-Thurs tapes. They overwrite every new week.  You'll need to test this out and see on average how much data your incrementals make.

I keep enough tapes for 2 full backups per group on weekly full Fridays.  That way I dont have to physically swap out tapes every week.  Once a full backup is done, I drag those tapes to its respective Archive media set, and rotate them out accordingly. These tapes are set to overwrite every month, so I can get restores effective to within a week of the needed date.

I keep one set of tapes per full backup of Monthly Full. Once that full backup is done, I take the tapes out physically and rotate a different set.  I then push the tapes to the Monthly archives in Backup Exec. I have the tapes overwritable every 3 months, as this is as far back my company requires Full backups to be kept.  

Any archives that need to be kept longer than 3 months are done on an individual basis

Now dividing the backups into 2 groups works for us, but may not for you.  We have dual drives to take advantage of.  Also, the spare GB's on each group of tapes may amount to alot of wasted space if you are in a short squeeze.

So if you have 3 Tb's worth of data to be saved on an 8 tape library with only 1 drive, you are most likely gonna need to swap out once a week at the very minimum. Full backups are fairly easy to plan for. What needs to be known is how much data is written on each incremental backup.

Author Closing Comment

ID: 31576882
This really got me going in the right direction.

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