How much temporary space is required for the Granular Recovery Technology path for restore jobs in Backup Exec 2010?

I have just installed Symantec Backup Exec 2010 and I successfully performed a full backup last night.  This morning I wanted to test the capability of restoring individual emails in an Exchange system.  I deleted an (unimportant) email from my inbox and then started a restore job just for that email.  After about 10 minutes of staging, the job failed with this error:

The path on the media server for staging temporary restore data when restoring individual items from tape ran out of disk space. Either clear some disk space, or click Tools/Options/Restore and enter a path that has more disk space.

The link on the Symantec site said to either delete files off of that drive (it's on the default C:\temp) or change to another drive with "ample amount of disk space to stage the restore data."

I have another drive I can use, but my question is, how much is "ample"?  The C: drive has 12.8GB free and, apparently, that's not enough.  I have another drive with 73.2GB free; that's the most free space I have on any drive.  How much will I need?

Thanks,
Jono
Jono MartinSystems AdministratorAsked:
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matiaslCommented:
I don't really know how much space you need but you should move the temporary folder since it seems to use quite a bit of disk space.

Perhaps as much space as the backup is ?

cutnpaste from: http://techiefixation.blogspot.com/2008/12/backup-exec-restore-e000848f.html

**Important**

The way that Backup Exec 11d does granular restores is that it will stage the entire information store on the path you have set. You will need to have that much free hard drive space in order to do a granular restore for just one or a few users. My organization is fairly small (under 200 users) but our information store is larger than 30GB. Just a heads up for all of you.
Jono MartinSystems AdministratorAuthor Commented:
Hi matiasl.  Thanks for the reply.

It can't possibly be that the entire backup (over 600GB in my case) has to be copied to a drive before it can find a file to restore, can it?  That makes the restore feature useless, as I don't have an extra 600GB of space on a drive to be used for temporary storage.  The backup is of all of the data on 4 servers.  It makes no sense that all of that would have to be copied to a temp folder in order for it to find 1 file to restore.

Can anyone verify that this is how Backup Exec does a restore?

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Jono MartinSystems AdministratorAuthor Commented:
Thanks.
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