You think your data is backed up.  It isn't.
You  think backing up your data is relatively straightforward.  It isn't. 
It takes a lot of work.  You think backing up your data is  your computer guy's problem.  It isn't.

We Believe
That backup should be kept simple
Everything should be backed up
There should be 10 or more copies of data
Data should be stored in 2 or more locations
The restores should be tested often 
When a backup device is 80% full, it is completely full
A backup device functions best at 50% capacity
Backup devices store much less than their advertised capacity