Not to sure about anything specific to ClarkConnect. As for gallery2, i'd simply copy the gallery2 folder to somewhere safe and the do a dump of the SQL database to a file. That appears to be a common method for backing up. As you can just restore them back and everything should be intact.

I would've thought there should be some RAID tools (probably CLI ones) available on the shell prompt.

Maybe I could have a look at it for you?
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Cheers,

Andy M