I will never use raid again. If the controller fails you have 2 healthy drives and no way of reading them unless you can track down an identical controller to read them. I didn't lose anything but my backup is now to an old PC with NTFS drives that I could pull out and read on another computer if I had to.
You striped
if you mirror (the sensible method) you get 2 identical discs that you can pull out and use on any machine.
Never stripe, you split the data between 2 discs, any failure and you lose it all.
You can stripe if you mirror as well (RAID 1+0), so stripe 2 drives and then mirror to another 2 drives.
Or RAID 5 and RAID 6 are available, but no real need unless you are enterprise level.
If you can Mirror with a hotspare. If a drive fails, it will be replaced automatically and you have 2 copies of your data again. You can then replace the dead drive and use that as the hot spare.
Always keep an offsite copy. Even if its taking an Ext HD to your parents house or work.
I will shortly be using Robocopy across a VPN. Take all the files over as an initial seed and then just use robocopy to mirror any changes.
Automate your backups - You always forget to backup just before a fail, its called sods law. If you backup automatically, you will never forget.