Each of my computers has a dedicated external hard drive where I push backups on a regular basis. I have one external hard drive stashed away at my parents where I make an backup of my laptop every time I visit them. My laptop pretty much has all of my important data so it serves its purpose. All the hard drives involved in this are encrypted of course.
On top of that my most important text documents(not necessarily important in the way of having personal information, but a lot of work put into) are backed up to Ubuntu One as well as Wuala.
Given how infrequently a lot of my data changes, I find the backups adequate.