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On Fri, Jan 11, 2013 at 2:45 PM, Joshua Welker <[log in to unmask]> wrote: > Reading the Glacier FAQ on Amazon's site, it looks like they provide an > archive inventory (updated daily) that can be downloaded as JSON. I read > some users saying that this inventory includes checksum data. So hopefully > it will just be a matter of comparing the local checksum to the Glacier > checksum, and that would be easy enough to script. > > One could also occasionally spin up local EC2 instances to do the checksums in the same data center, and ship just that metadata down - you would not incur any bulk transfer costs in that case (if memory serves). DAITSS uses both md5 and sha1 checksums in combination, other preservation systems might require similar. -Randy Fischer