[viraptor]

What filesystem are you running on? Can you snapshot it outside of the postgres environment? The database may be mid-transaction at that point, but it's still better if it does log replay at startup, than losing all the data.

Also if your filesystem snapshots can be exposed as files / block devs, you can rsync them to another host lowering the amount of transferred data (keep the previous copy so rsync will only copy the blocks that differ).