My pictures go onto the computer and I back those up but I also just keep the SanDisk with all the photos and movie clips and purchase a new one. They are so small and easy to store. I back up the photos by burning them onto disk twice. So, 1 copy on the SanDisk, 1copy on the computer (with some deleted), and two copies on separate disks.
That is a great start – I would recommed one location that is offsite. I use Amazon Prime’s free photo storage and also the Carbonite backup services off site. That way I am always prepared.