OK, allow me to split my comment into two parts. First, in terms of data integrity, IMHO it normally shouldn't be necessary to manually perform frequent file system check ("fsck") operations unless you start to experience erratic system behavior (eg, the partition won't mount, error messages are being generated, etc) or otherwise suspect that something is seriously misbehaving with that drive. If you're using Ubuntu, your disks most likely were formatted as ext3, which is a journaling file system. At the risk of telling you something you already know, journalled file systems (like ext3) are pretty resistant to corruption, even in a bad scenario such as a power failure. (That is not to say that ext3 partitions are immune to data corruption, but ordinarily, and even in the event of a crash or unclean shutdown, ext3 partitions are usually very stable. In my own experience, over the years my machines have experienced a number of crashes and/or power failures, and luckily for me none of them produced any serious side effects or data loss. I'm sure it'll happen sooner or later, but so far I've been lucky)
Second, and given that your drive is performing as expected, you might also consider burning your important files to a DVD, just for additional peace of mind. Obviously hard drives can and do fail, inevitably at the worst possible time, and although it's a cliche a good set of backups can be invaluable. Personally, every couple of weeks I copy my important data to a DVD, and you might consider doing the same if you aren't already. As a photographer, I suppose it might be useful to have your portfolio be easily portable, and if your files are commercially valuable you could also store that DVD backup in a safe deposit box, etc.
Overall, if the main concern is just to avoid any large scale data loss, make backups :)