I think we have a winning idea here. Thanks.

Josh Welker


-----Original Message-----
From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of Randy Fischer
Sent: Friday, January 11, 2013 3:46 PM
To: [log in to unmask]
Subject: Re: [CODE4LIB] Digital collection backups

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