Originally Posted by superkyle
my plan it to attach one of these http://m.newegg.com/Product/index?it...82E16816322004
To each port giving my external raid also.
you seem to know much more about this than me. If I want to backup my data in case of failure what is the best way to do so? I did plan on using raid for this although I know it's not perfect but I have thousands of songs and although I'll keep many on a thumb drive as a just in case I'm interested to find out the best way to do this.
First of all make sure you understand exactly how each type of RAID works (RAID 0, 1, 5, 10 are the common ones). Read here: https://en.wikipedia.org/wiki/Standard_RAID_levels
For example RAID 0 gives a speed boost which will be useless to you and makes your data less
robust, loss of one drive causes loss of ALL data.
RAID 1 across 2 drives is pretty robust but you're buying 2TB of space for every 1TB stored (0.5 storage efficiency).
Its a trade-off between how much data you want to backup, how robust the backup needs to be (i.e. is it life or death if data gets lost or just a mild nuisance?), how quickly you need access to the backup and how frequently you need to update it, and how much you want to spend (i.e storage efficiency).
I'll give you two examples:
1.) I have about 25GB of pictures and word documents that I cannot
lose, but if my primary copy is lost I don't need access to the backup straight away, and the backups never need updating, and I didn't want to spend much. So I bought 5x 32GB memory sticks, copied the data to each of them, and hid them around my house and workplace. Even if my house burns to the ground I will still be able to retrieve the data, but not quickly. The storage efficiency is very low but because the dataset is small it still isn't very expensive.
2.) A friend rips all his blurays to HDD for convenience, the data comes to 10-12TB. The dataset is updated regularly (he rips new blurays weekly) so the backups need to be easily accessible to update, but if it the data is lost its not the end of the world, he'll just have to rip all his blurays again. I recommended he buy an external HDD enclosure (similar to the one you linked to), put 4x HDDs in there and run them in RAID 5. This way he has instant access to the 'backup' for updating, the storage efficiency is 0.75 (for 3TB stored he buys 4TB of space), and the array can tolerate the failure of 1 drive, but if 2 drives fail together he is screwed.
If your backup is life-or-death important avoid RAID altogether and use another solution (there are plenty of expensive backup solutions to choose from). Because if the RAID controller dies (and it does happen on occasion) then all your data is lost forever.