Hello,
Can you not put in any temp space on the server to restore, if not try 
restoring back to alternate directory, when the data is being resgtore, 
start deleting files as they get restored, you will know the restore 
performance, you dont need that much disk space and you dont have to 
overwrite any thing, although restore performance has many more variables 
before you can say you have a good handle on it, i.e multiplexing on a 
given backup day, serverload, device settings, network etc.

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