I would STRONGLY (there's been a LOT of security updates since then..) suggest the following:
1. Make some notes of any special settings you have (SMB, users, etc.)
2. Disconnect the data drives.
3. Download the current OMV ISO (1.xx)
4. Install it to your OS drive
5. Reconnect your data drives
6. Set up your services again.
That will make all this irrelevant, as on the new install you simply create two new raids (one with the old drives, one with the new drives). Then, make a habit of logging in to the machine an updating/upgrading once a week. Since the data and OS drives are (or should be) separate, you can do the above and there will be no risk to losing your data.. though backups are always a good idea of course.