Always back up your data!... more than once.
Sure, we can do the "my backup is better than yours..."
So let's start... at home..
Servers are Replicated to Secondary Servers offsite - with hourly snapshots - handy for some basic recovery stuff.
Servers are backed up locally to Hard Discs (in an array or 3, every 15 minutes)
All data (documents, music files, photos, that kind of stuff) backed up to 2 different off-site services (one I control, one I don't directly control) - real time as it happens
Daily Image sync/updates and backups to another offsite location.
And yes that's at home. Because I'm paranoid. So multiple places, types and shapes of backup imaging and recovery options.
I don't want to be THAT guy at work who preaches about backups to everyone else - staff, customers and so on, and then be the one who has to admit they lost stuff. It also serves as a handy way to check how good or bad this stuff is in reality.