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I have a Win7 setup where I need to mirror, a local folder onto a NAS. I've tried Microsoft SyncToy but that is entirely too slow and produces inaccurate results. A requirement is that open files must be copied so Robocopy will not work. I believe the only way this will work is something that is built using VSS.

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What are you going to do with the data on the NAS? Are you trying to setup a backup, or will this data actually be used? –  Zoredache Feb 18 '12 at 13:24
Potentially it will be used, so it has to be "live" data and not a compressed backup. Basically, we're doing a remote backup also but I want to mirror the folders locally so if there actually is an issue, we can failover to the NAS rather than wait for the 50+ gigs to download from the remote backup. –  Ryan Brooks Feb 19 '12 at 16:26

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