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I have two machines, one with mdadm RAID 1 on root partition and one with mdadm RAID 10 on root partition with 4 drives. Ubuntu machines, now I need to upgrade these.

If something goes wrong I need a surefire way to restore original content. What is the proper method for that?

If I save every single drives content with dd then I think it can be restored. But that way I need 2 times more storage then actual content. Is there a better way which is still absolutely fail save?

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