An update, since a few people asked for something. 

I need to backtrack on my original statement that removing compression didn't 
make a difference, I must have forgotten to restart the director after making 
the change. 

In fact switching from GZIP to LZO had the greatest performance gain, even more 
than switching from sqlite3 to mysql or postgres. 

I setup a new server and did a small scale test, ~1.3GB of email files and misc 
config files. I ran each backup a few times, the elapsed times would vary by a 
second or two but generally were consistent. Personally, I felt the extra 
compression GZIP offered isn't worth the extra time it takes; that's why I 
focused mainly on LZO. 

>>From my testing, it appears the 'best' setup is PostGres w/ LZO, then MySQL 
>>w/ LZO, and lastly SQLite3 w/ LZO. 

I tried to upload my screenshot to this site using the 'add image to post' 
tool, but the site blocked me saying, "Block reason: Exploit attempt denied by 
virtual patching (level 2)." 

So here's the screenshot hosted elsewhere: http://imgur.com/Rm5hS9f

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