raid 0 + backup = no no
Raid 5 + backup = perfectly acceptible
raid 1 + backup = overly redundant imo I mean it's already a backup.
Raid 10 + backup = likely a waste of a drive depending on your speed requirements
Single drives are fine too, but don't give you the large single volume which is beneficial for backup. Though tbh may main backup is a 2tb single external, but my NAS is a raid 1 config.
RAID 1 is not a perfect 100% Backup.
1- if your OS get corrupt, because of a caching error that has been replicated on the 2nd drive, it's failling..
2- if your PSU blow, and take down the 2 HDD, it fails.
That is the reason why I have RAID 1 + external BU, I would just need my home to burn to loose everything (and I am about to get a fresh copy of DATA every month, and leaving it at my parent's home.)
So based on what I've seen, RAID 5 means you need an even number of drives 2,4,6,etc.. What if I have 3 2TB drives, an odd number of drives, does that I get 3TB of usable space? The only reason why I don't want to RAID 0 is because I'm afraid that if 1 drives fail, my files will be lost forever. But based on what I've read from your comment RAID 0 has never caused any problems for you. Hmm... And I'm working with a relatively small computer case which has 3 slots for HDD. Luckily I was able to mount my SSD (OS & some programs) on the bottom
RAID 5 = parity: 3x 2TB will result has 4TB, but formated will be 3,63TB.
But like any raid, it is not 100% safe
but raid 5 has a good redundancy, you need 2 HDD down to have the RAID down.
That would be wasting alot of space... Why everybody so scared of RAID 0 its not like his desktop is a server holding top secret info or something... RAID 1 just mirrors the drive... sounds like waste of space... and with raid 5 with two 2TB drives and two 1TB drives there is going to be alot of unusable space... 2TB of wasted space... the only thing that is important to him is the pictures and movies, which can be saved directly to the non raided HD.
EDIT: How many people here have actually had a hard drive fail without knowing its about to go?? I mean you would hear it failing wouldnt you?
no... My black 1Tb died like this, unable to resync, wouldn't pass Short test, like that, the day before it was working perfectly.. you can have Electrical problem in the drive, which can cause a failure very fast.
Saving important documents on a raid 0, you must have a backup..