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Is there a way to take a 'snapshot' of sorts and have my backup server mirror my live server, as a sort of testing environment? I know I've seen a lot of answers saying to use rsync. I'm not sure if that would work with what I have in mind.

My live server is currently on Ubuntu 10.04 and my backup server is currently on Ubuntu 12.04. I've also made changes in the partitioning that I wish to eventually move over to the live server once the backup server seems fine, but I want to revert to the old live server should anything go wrong.

Any ideas?

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What are you using these servers to do? This problem is probably better solved at the application level. –  jamieb Jul 23 '12 at 23:30
    
It is a LAMP web server that accepts information from a remote server via ftp. It also has Postfix for the contact webpage. –  BLaZuRE Jul 23 '12 at 23:44
    
Considering your use case and that you're using two different OS versions, replicating at the app level is probably the best option. What's wrong with using rsync? –  jamieb Jul 24 '12 at 0:10
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