For contacts, email, calendar I just use the google cloud. For works in progress not on FTP or GIT, I use dropbox. I had a raid array fail on the controller, so I only do incremental backups now. I have a duplicate sized hard drive for every hard drive I need backed up. For my mac, I use superduper and for my pc / linux machines I use clonezilla which does an excellent job. The downside with clonezilla is that it is an OS so you need to have some downtime before you backup. The good side is that it backs up entire disks regardless of the operating system / partitioning / etc.
