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I have to replace all disks of a Raid 5 volume for more space on a Windows 2003.

I want to see what is the more reliable method to backup or move data of this volume (about 800 Gb).

In first I was planning to robocopy all files on a external USB Drive. But I really not sure that's the best method for that kind of job.

I'm thinking to make a full backup of that Server/volume and then make the restore. But what about a remote VSS backup on the External drive ? A good method, feasible ?

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If your hardware supports it why not take this opportunity to do some virtualization? –  ErnieTheGeek Jul 16 '12 at 15:12
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I'm a big fan of robocopy, and use it all the time to move large amounts of data.
I hope you already have a backup of this data. You should not need another backup to move data like this.
A lot of hardware based array controllers will let you remove/replace the disks, one at a time, not doing the next disk until the former has finished re-striping, and then expand the LUN from within the array controller. Review/research your controller model. Then you can use DISKPART from the OS point of view to make the NTFS partition within that LUN larger.
The DISKPART commands would be something like:
list disk
select disk 99 (where 99 is the number of the disk)
list partition
select partition 99 (where 99 is the number of the partition)
extend

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Thanks for the input. I'll search for that kind of remove/replace thing for further job. –  Patrick Pellegrino Jul 17 '12 at 14:57
    
But now, in my case, I have to use less disk in my raid for keeping one spare (all other spare disk less in GB). The server have 26 disks of 146 GB and I have to replace 9 with 600 Gb so I have to redefine my Raid/volume. –  Patrick Pellegrino Jul 17 '12 at 14:58
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