What would be a robust way to backup business data prior to server relocation?

I am relocating 5 pairs of clustered Sun servers complete with a 2 SAN boxes (StorageTeck 2540). The size of the data is 2TB.

Currently the SAN boxes are backed up through tape but i do not have a similar infra at the new site to restore them in the event that things go wrong during the move.

What would be a robust and economical way to backup the data into something i can recover from at the new site. The new site is having Tivoli Storage Manager infrastructure.



vleongewAsked:
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Thomas RushCommented:
Rent a compatible tape drive for a month to put at the new site.  For some values of "rent", this could mean, "buy one used on ebay and resell it when you're done with it".

To ensure the highest level of safety, run a test restore of a tape written with your current drives, but restored using the new tape drive.
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vleongewAuthor Commented:
Thx selfgovern. I ack that this is a possible solution but am thinking more along lines of using existing resources. I have a NAS (1.5tb mirrored) at my new site and both sites are linked via a gigawave line. Is there a way I can backup direct to this NAS and restore from it if necessary?  
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Thomas RushCommented:
I imagine there is.   Others here will tout Acronis and other mirroring solutions, but you'll need to make sure they work in your environment, since most here are much more familiar with Windows..  My concerns about restore from NAS would be two-fold:
1) Is it a tested restore solution?  If you need to use it, do you know how to do restores well enough that you can do it under the worst conditions (most stress and time pressure, least available resources, least familiar environment)
2) NAS can be terribly slow.  How long will it take to restore one or more servers over NAS?  On the other hand, tape (despite its reputation) can be quite fast.  

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