Retail store network move

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http://serverfault.com – I work for a retail store company and was tasked with improving store relocation process. Now, there is a window of a weekend to move all servers, PCs, and devices. The current proposition is to setup identical network (including buying new PCs and devices) and point them to the old store's POS server for testing, and then just move that server to the new location. I was hoping somebody can give a few pointers from experience. (HowTos)