11- replace keyboard and mouse after 2 years of use.
Oh, I dunno, maybe
wash your hands and don't always eat or touch your face/hair while using the PC.
The guy with the nastiest keyboard at my office doesn't always do the first, and routinely does the rest. I even complained to my boss, when I saw him go #2 and walk right out of the men's room without even going near the sink. On multiple occasions. It seemed to do the trick, because he's always pointedly washed his hands since then, at least when I'm in the rest room (I have wondered if he knew I'm the one who ratted on him).
Anyway, whenever I've had to touch his keyboard, I immediately wash my hands before I touch anything else. I mean, for the years that we actually worked together, back when there were these things called office buildings and people would work together inside of them.
But,
every 2 years? That's
nuts!! I routinely get about 5 years, or more, out of decent mice or track balls. And I've used the keyboard I'm typing this on for about the last 15 years. Just buy decent equipment and take care of it. It's really not that different from your point about quality fans paying off, over time.
12- double check any harddisk that is out of warranty , move the DATA ASAP when it is out of warranty. and dont buy cheap 3 years warranty one.. go for the 5 years warranty ONLY.
First, the boring but sound advice is to backup anything you don't want to lose. If you can't afford to backup everything, just backup the stuff that's more valuable to you than the price of the backup media. If you're having trouble deciding, imagine you lost it and ask yourself how much you would pay to get it back. Incidentally, I use a similar strategy for deciding how much to bid on ebay auctions for items without a well-established market value.
As for failing disks, check the SMART stats and look for error messages. You can also run the drive's own self-test, though a lot of drives seem to periodically self-test themselves, these days.
As for warranty terms, I just had a disk fail after < 100 hours of use, even though it was sold as an "enterprise" drive with 5-year warranty and supposedly 2M hours MTBF. You can't entrust your data to a warranty. Still, the warranty is perhaps reasonable assertion about the expected service life of a disk (i.e. how long you should
plan to use it, before replacement). In spite of that, I just got nearly 10 years out of 5 disks (100% survival rate) with a 5-year warranty, but they spent about 85% of the time powered down.