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 Having a backup strategy is almost useless if you don't also test it from time to time.

The time to test disaster recovery is not in the middle of a disaster  
 Just store your posts on 10 relays, problem solved. 
 Chaos Monkeys FTW 
 This. And another often overlooked and key consideration is the RTO. It's one thing to have a good back up, and an entirely different thing to get the data restored in a timely manner. 

If you can't withstand the downtime, you may need to rethink your backup strategy.