How are you going to backup your system?

Are you going to backup your files to an external hard drive? If so what?
Are you doing to backup your files to your 2nd internal hard drive? How?

RAID is not a backup
Yes… it is. Backup is by definition is "the procedure for making extra copies of data in case the original is lost or damaged". Nothing more.
With a RAID mirror you have two or more originals which makes it a backup. Does it provide an archive or revision history of your data… no. But that's beside the point. It is a backup. Does it protect you against all circumstances that results in data loss… no. Again, that's beside the point.
A RAID mirror is still a backup,
RAID is protection from hardware failure. If a drive dies, you have a full working copy of everything... that's great.
Not always true! Under some RAID schemes a member failure will result in complete data loss. RAID is not always about "protection from hardware failure".
Only something that archives… [snip]
Not everyone is prepared to and sometimes not even capable of having such a rigourous scheme as you do. For the vast majority of users out there who have no contingency plan what so ever the best solution is in fact a RAID mirror as it's a no effort and cheap solution. It's a solution that protects against a very specific circumstance. For a more complete protection you are right, other means should make up the rest of the package.
While RAID mirrors shouldn't be a standalone solution it should be considered as part of a complete scheme.

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