Thanks very much Eliot and Matt. I didn't know about gzip storing the original filename, thanks for the tip about the -n. As you say from rsync's point of view I'm sure the difference is negligible.
Can you point me at any usage examples with rdiff. I've searched quite a bit and apart from the cygwin man page and the "rdiff -?" usage message I'm unable to find enough information for me to see how to use it successfully. In particular I'm not sure I see how it would be used in my scenario. Currently there's no local copy of the backup image file. All the best, Cheers, Mark
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