We both use laptops, but run headless ubuntu machines with bittorrent sync for backups and staying up to date. It's a terrible system and we should be ashamed, but it works. Soon we'll have a software developer with us (hopefully) and I'm sure the ballgame will change. Maybe github on those 2 headless machines? dunno...
We use CouchDB for distributed instances, using Digital Ocean droplets with backups there as well…might not be best practice.