Heh, this particular model is well known for having a high failure rate. Mine did pretty good, considering. I bought four when they were brand new and put them into my server, running OpenSolaris so that I could use ZFS. Ran them for a couple of years, then the server ended up being stored in a metal shed in a forest for five years. Used it for a short while then built a new server. Three of the four disks had a ton of bad sectors, but ZFS came to the rescue and let me transfer everything off without losing a thing - it just took a while. I used the fourth drive as a backup drive for a few months before it started throwing errors.
I still love Seagate and have always had great luck with them, it's just this particular model that had issues :P
If it's really, really important I would probably RAR it with a larger % of recovery records, then use PAR files against it, then store it in many, many places. And every once in a while copy it to new places, checking the PAR files for checksum errors.