For the last 20 years (when I first started shooting digital) I have had a New Years Day ritual of backing up all of my images from the previous year to either an optical disk or now I use 4TB USB external drives. I have two dedicated to this and leave both of them in different locations. I also do weekly image backups but this ritual goes above and beyond that. I completed that task within a couple hours this morning. Just a reminder to all: Don't forget to roll the year of your copyright information contained in your EXIF data.