2 bad sectors is not a lot for a drive that is 5000 hours old. However, you should keep an eye on these attributes, plus the Reallocated Sectors Count, in case they start to increase.
As for the Load Cycle Count, many WD and Seagate users (yours looks like a Seagate) are worried by these numbers, but both Seagate and WD claim that there is nothing to be concerned about. I think it's a matter of judgment. In any case, at your present rate of usage, this attribute will hit the threshold (200,000) in another 6 years or so, so you may never see a problem.
On the question of backups, a reliable backup strategy is always advisable, even when the drive is 100% healthy.