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Backup size

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Backup size

I have a problem since i purchased above mentioned device. every time when i backup files on the tape using NTBackup i am getting less than 50 GB on 1 tape and not the whole 72 GB. i have upgraded the firmware also but the capacity problem is still there. USB device is connected to USB 2.0 Port. the tape device is connected to Windows server 2003 SP1 machine.

TIA-Ariyan
6 REPLIES
Kranti Mahmud
Honored Contributor
Solution

Re: Backup size

Hi Atiyan,

The dat72 drive and dat72 tape native capacity is 36GB. This means that on the tape when it gets full, you have 36GB of COMPRESSED data. Now how much UNCOMPRESSED data is this? It depends on your data, it looks like you data does not compress much that's why you get about 40GB.

The DAT72 states 72GB capacity assuming a 2:1 compression ratio. That means if the data compresses 2:1 you could fit 72GB of data compressed to 36GB in a dat72 tape.

Rgds-Kranti
Dont look BACK as U will miss something INFRONT!

Re: Backup size

Hi,

Then what shud I do to get the backup of higher capacity?

TIA-Ariyan
Rob Leadbeater
Honored Contributor

Re: Backup size

Hi,

As already mentioned, the amount of data that that you will fit on the tape, will depend on how compressed it already is...

If your files are already compressed, zip files for example, it's not possible to compress them further, in fact they may end taking more space on the tape than they do on disk...

Cheers,

Rob
Kranti Mahmud
Honored Contributor

Re: Backup size

Hi Ariyan,

I would suggest you to nget hold of an LTO drive.

LTO drive has much higher capacity and much better performance. Something like an LTO-2 Ultrium 448 would probably be adequate (200GB native capacity

Check the belw link for LTO drives:

http://h10010.www1.hp.com/wwpc/us/en/en/WF04a/12169-304612-3446236-3446236-3446236.html

Rgds-Kranti
Dont look BACK as U will miss something INFRONT!
Rob Leadbeater
Honored Contributor

Re: Backup size

If you need more capacity, buy a bigger tape drive !

You could go with the DAT 160 range, although personally I'd go with an LTO based drive rather than DAT...

http://h10010.www1.hp.com/wwpc/us/en/en/WF04a/12169-304612-3446234-3446234-3446234.html

http://h10010.www1.hp.com/wwpc/us/en/en/WF04a/12169-304612-3446236-3446236-3446236.html

How much data do you need to back up ?

Cheers,

Rob

Re: Backup size

Thanks