Quote from geaves
No sorry and a net search reveals very little.
I haven't been able to find anything either. Seems it might be more of a Debian issue than OMV issue.
Is there any particular reason why you're using a Raid rather than two drives and using rsync.
Seemed like the path of least resistance. Don't need to back this stuff up off-site, but a RAID 1 at least provided some easy redundancy.