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Veritas - backup size estimate

i have veritas 10 i need to know what size backup tape drive I need for the current data? how can I tell how much my backup will take
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zenworksb
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zenworksb
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1 Solution
 
that1guy15Commented:
If you have 100 gigs worth of data i would get a tape that could hold at least 120 gigs (for growing room)

They advertise tapes with compression ratios like 400/800 (uncompressed/compressed) in reality you will get around 1.2% compression so 100gigs compressed you can expect around 80 gigs compresses.

now that is just an estamite. depending on your data and if it is already compressed or not you might get more or you might get less.

Not knowing how large the data is you are trying to back up i cant suggest any tapes.
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dave4dlCommented:
get one that is at least as big as your source data.  Compression may require it to take up less space but you don't know that for sure.  I recommend a drive at least 3 times the size of your data (this will allow for a few incremental backups on that drive.
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zenworksbAuthor Commented:
i am sorry I guess the question was not clear I need a way to know how much data will be backed up with system states etc. i am in veritas and wanted to know if there was a way to deteremine this
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dave4dlCommented:
what OS?
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zenworksbAuthor Commented:
windows
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dave4dlCommented:
if you are backing up a drive, right click on that drive and select "properties".  It should calculate how much data is stored on that drive.
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that1guy15Commented:
have you already ran a backup of the server you are trying to get this info from? if so then it should list in the backup log. if you haven't just run a test backup of just the system state and the logs will tell you.
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zenworksbAuthor Commented:
i ran the test backup so the total used would be it says total byte count 3,395,903,306????
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cooleditCommented:
Hi, Zenworksb

When working in the IT Industri there are a few things to consider when purchasing changing your technology look forward, try to estimate what is the growth in 2 years time.

Also go for the right technology first time if you can. there are a few considerations I try to follow and that will save you money to in the long run. In your case I will touch the differences on LTO and what to choose

1.   LTO 2 versus LTO 3 Speed, could scale your backup window for the future in case the data grows             dramatically which you can not control but your manager can. LTO 2 200-400GB try to sell it to your manager like there can be 400GB with a compression ratio of 2 but that is never going to happen with all you data expect a ratio of 1.4 - 1.6. so LTO 2 realistically 286GB of data. LTO 3 400-800GB a backup speed of 2GB per min when it is slow 400*1.4 = 560Gb on the tapes. i know yes they cost more but you are safe for the next year or 2. If you where going to by LTO 2 know it is already old technology.

2.   Consider a smaller tape library unless you are going in a night when the drive needs cleaning.
      A job can also be configured to auto eject to the mailbox, maybe in the future your jobs is going to spand over more than 1 media, what if more servers come in to place of your backup,

3.   Make a proper backup strategy like 1 full a week, 1 differential the rest incremental. For how long will you need to keep the data, so how many rotation media will you need.

4.   Be sure if your backup grows quite fast get a backup Software with a very good media management.

5.   Is there some of this data that is so essential so you need fast restore, consider maybe some SAN storage if you need your data back fast.

So I hope you can use some of the ideas here. If needed I can guide you further.

Cooledit
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zenworksbAuthor Commented:
thanks for the ideas, but I need to know what size i need that is what I am trying to figure out so I can present to management and go forward
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cooleditCommented:
you could try

treesize....

http://3d2f.com/pcgi/search.cgi?text=TreeSize%20Free

Cooledit
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