For my home directory/active data I use 'rdiff-backup' to keep 7 days of hourly snapshots. If I screw anything up I never lose more than an hour. My bulk data

For my home directory/active data I use 'rdiff-backup' to keep 7 days of hourly snapshots. If I screw anything up I never lose more than an hour. My bulk data gets a snapshot every 3 days due to the size/time. All that data is already on raid1 but the extra filesystem level backup will protect from any low level disk hosings. I mirror that backup drive weekly and keep an extra copy off site. If I'm super paranoid about losing something I'll also save it with 'duplicity' to S3, although I also like remote mounting an AWS volume and using it with 'EncFS'. If I'm going anywhere with my laptop and want access to my data faster than internet speeds I'll preload everything with 'unison' onto the laptop and temporarily have my own Dropbox clone while mobile. Using those open source tools lets me do basically the same thing as these services while keeping full control of my data.