In the past I had problems with BCP because when I try to copy the data to a file some times SQL introduce returns between the data and when I try to reconstruct again the images I got errors.
Yes but if you actually set it up to replicate the data over (meaning physically create a publication/subscriber), the snapshot will create multiple bcp chunks for your automatically and should keep everything in sync.
If you can't use snap shot replication as a one time deal, you really only have 2 options: 1) have the SAN guys take a snap of the LUN (as Jeff has mentioned) or 2) break it up into a match style job, transferring over x-number of rows at a time.
I can't think of anything else that hasn't already been mentioned
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