Current Setup: server 1: perfect wheezy, apache2: ispc3 cp, dns, web, db. 8 core, 2 TB raid 1 server 2: perfect wheezy, apache2, courier: web, db, webmail (sogo), email. 8 core, 2 TB raid 1, with 1 TB in email data. backup is via back-res.sh on both servers, incremental daily, monthly full. You can imagine the time it takes to backup server 2 on the monthly. I'm trying to figure out the best way to make this setup more fault tolerant at very least for th email server and for backups. - setup a secondary server for each (master./master, master/slave...etc)? - what's the best way to keep a secondary email server (remember it's not dovecot)....rsync? and only run full backups on the secondary server? - Could I get by with a single 8 core server and virtualize 2 x 4 cores to be secondary servers to server 1 and 2? As you can see, I'm curious how others have production environments setup, and maybe that will help me with proper questions.