I have a WD Caviar Green 500gb that someone gave me and i was thinking should I put it in my New PC or Put it in the new one im building or should I use it as a BackUp/Storage thing?

You should use it where you need it most. If you dont need it, why install it at all?

I think i should use it as a Backup so when my pc does get buggy

Use it as a door-stop, buy another 10,000 and build a HD house, paint it and use as an ornament.

Seriously Robert, if there was an award for pointless question of the year...

[hint] ONLY you know the answer to the question you have asked, as Jorge has pointed out.

Being uncertain as you seem to be, I would open it up, remove the immensely strong magnets from the arm motor, and stick them on the fridge door whilst you choose from the almost unlimited variety of uses to which they can be put.
I cannot think of any at the moment, but something is sure to occur to you one day.

Anyway, from the tenor of your post I'm guessing that you do not have a backup disk drive right now. Not just a partition on your main hdd... that just does not cut it as backup at all. A separate hdd for backups and warehousing of stuff is safer. So use it for that. You could even put your main page file on it as an outer (first) partition to speed your sys a little, with still a small one on your main hdd.
If you don't put a page file on it, but just use it for backups and warehousing then set it in power options to shut down after, say, 10 minutes, because you will likely set your backup software to run just once daily. Less wear and tear on a seldom used drive. With ten minutes, if you are doing incremental backups every 5 or so minutes on some important file as you use it, it will stay on for the duration.

lol thats funny happygeek
SERIOUS! why would i want to build a HDD house im not that stupid.
And 2 serious happygeek no offense or anything ive already got a 2TB HDD PC and at least though gerbil not having a go at you but I would only do a BACKUP every 2-3 months i was going to buy another HDD so i could use it as BACKUP Storage but i definitely dont want to whinge to happygeek about this so consider this resolved oh and happygeek ornament hdd houses are for babies.

PS: sorry JorgeM for wasting your time.

commented: I think I have enough old drives to build a small house! :-) +12

" I would only do a BACKUP every 2-3 months"
EEK!!
My sys does one (incremental) every day if it's running. And I re-image my system drive every couple of months, and disconnect and remove the image disk. Why? Because I KNOW it takes at least a full day of hard work to get a new installation set up completely. No thieves, no viruses or kiddies where you live? And disks do die.
Seriously, SyncBack (or similar) is the go. Free, can be scheduled, and will do automatic, periodic, background backups of work if you so wish. Has the power never gone off at your place?
If you've got a good BU software, you rarely need to touch it. Another thing, there are a LOT of posts on forums about file recovery, there are businesses which do little else, and all because people don't do timely backups.

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