I back mine up crazy amounts as well, while at school, i use 2x external hardrives, one main and one back up. After going threw keepers and tosers, edit what i want for the day. Then i back up to 2x 1tb hard drives. the finished images get backed up, while i keep them on the external hard drives until finished. Some times i back up to DVD/CD and give to my dad to keep at his place. Normly its images i sell or a wedding.