Quote:
And it only protects you a little bit, not as much as a true backup would protect you.

Well, that's both true and not.

It prevents you from having downtime. If you had a drive fail while on the road, you could carry on with only a reboot.

It also prevents you from having to restore from backup, which can be a pain. However, the replacement drive has to copy all of the data from the remaining drive. On an always-on computer, this isn't an issue, but it took me several hours to sync a 10GB mirror, during which time the empeg had to remain powered on. Powering off before completion requires that the procedure restart from the beginning.
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Bitt Faulk