Setting up a good backup strategy for your personal data has become an absolute necessity for everyone. Today, there are numerous apps and web-services out there in the market that make backing up your data a child's play. And with storage moving to the "cloud", it has become quite cheaper too.
All my critically important data, including the data that I keep requiring access to on a daily basis, stays in my Dropbox folder. I have a $10/m Pro account giving me ~120GB of Space and at the same time, lets me access my data from virtually anywhere.
My iMac is backed up using SuperDuper! onto a FW800 Drive as well as a NAS. I use SuperDuper! instead of Time Machine because it does bootable backups.
And then there's Backblaze for the "Cloud".