Solve : RAID backup: 2 x 500GB to 1TB HD? (Is it possible?)?

1.	Solve : RAID backup: 2 x 500GB to 1TB HD? (Is it possible?)?
Answer» I have two 500GB hard-drives. I have two questions. 1. Is it possible in principle to backup two RAID drives to a SINGLE 1TB drive? 2. Would it be possible to use a freeware backup APPLICATION such as Cobian for automated daily incremental BACKUPS of this nature?

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