RAID setup?

[JET]

Alright, after losing 2+TB of data due to a 6 week old Seagate drive puking, I am going to be doing backup of some sort. I tried to research RAID's a bit, but there are like 50 different kinds.

This is for my media server, the computer runs 24/7. I run a 1TB Samsung F3 drive for the boot and program drive. I will be running two 3TB WB Red's for the main storage drives, I will use the 2TB and 3TB seagates I have right now for backup drives. I am only back up to 2.5TB of data now, but adding on fast. I will probably be around 4TB at the end of the month. I will add more Red's as needed if I am happy with them.

I am fine with backing up once a week and I would prefer the seagates to only run when backups are being performed. My 6 month old 2TB is now starting to make a little noise when worked hard.

So, what do you guys think will be the best option for backing up for me?