Hi Vicks7
I am not an expert,have read pages upon pages over the years on this topic and seems to me,that,people who know their way around with computers trying and explain it,in such a way that make it so hard to understand and follow instructions through.
Here is my method for better or worst.
Music is on my main hard drive,a WD My Passport Studio 1TB.
Then this drives is backed up on another WD My Passport 1TB.
The second drive stays disconnected and only gets hooked to my Mac for back up of new files added on the primary drive.
Then an extra back up to WD My Book Live 2TB exists over WiFi.
Finally a Lacie 3TB acts as 4rth back up that is also serving music to my macmini i5 server/JRiver music player.
A few months ago I bought a Assustor NAS (two bay) along with one WD Red Seal 4TB hard drive.
I haven't used it yet and still remains in its carton,I am getting a second WD Red Seal 4TB soon and will get it all set up. But I know already it will be a challenge for me and my limited knowledge with networking.
I have not figure out yet (even though it was explained to me) how to perform an automatic back up update of new files added from one drive to another. I believe it's called rsync this or the other.
I still do back ups manually,you know it works and it's not so bad.
Sorry for the long post.
George