There are many different "levels" of RAID, which all behave differently. However, one thing they share in common, is you need multiple disks. It's also one of those things where if you don't even know what it is, odds are real good you don't need it.
If you want to do backups, I'd suggest a CD or DVD burner, or possibly an external hard drive. They're simple and quite effective for most people.
When the day comes that you're running your own private data centre, you can think about using RAID for backups.
Being totally computer illiterate, I am often times at a loss for what I am doing on this machine. Sometimes it is like wlaking accross a mine fireld.
Anyway I am having problems setting up RAID. My son says it is good for backing up files, I wouldn't know because mine don't work, like some people I know.
I might as well be walking on Mars. HELP!!!!!