No RAID level is a replacement for backups. So, you still ned to back up either way.
The two aren't the same. Backups are backups. Backups are not RAID. RAID halls ass. It has a very specific purpose. 1, 10, 5, and 6 additionally have a hardware level of protection. But it's not a backup mechanism either.
With my RAID 0 I feel I have ONE really big, really fast hard drive .... and a really big reason to back-up, and a really big reason to operate everything on a UPS.
So hopefully this thing is forcing me to be disciplined and smart. Not a bad move, I think.
I should have had an automatic back-up plan for years (instead of manually backing up drives and files to random external HDs whenever I feel like it). And given that we have power outages here in LA every summer, I should have had an UPS in my office too. (Coincidentally, today is another pretty warm day in LA, and my wife just emailed me, there was a 2-min power out in her office building in downtown.)
I have both an UPS and an elaborate automatic back-up schedule in place now, and that's mainly because of the risk of the RAID array. Works for me.