EDIT: Sorry I did not notice this thread is about omv 0.2. This way is only tested with omv 4 and 5.
Truth be told, neither did I. I built my NAS a month or so back using OMV 5.
I did get things moved over but, I stumbled through it a bit. Fortunately the drive that started to fail was one I used for backing up connected pc's and storing software downloads. If I lost the content I could have run new backups of the connected pc's and download other missing content.
I'll chock this up to a good live fire drill or practice run. In the event that one of the other drives with more critical content fails I have at least worked through this once.
Thanks All for the feedback and advice!