Yes, you should have all your data back. Whatever happened during the power-off and move, something hiccupped preventing the storage manager from starting from the last point it stopped.
To prevent this from happening again, mostly you want to avoid having to deliberately interrupt any RAID build, rebuild, migration, etc.
After the recover NTFS disckcheck repaired a lot of 'floating files'. I did get a terrybyte in data back, all the files where there but their contents was completly mixed, each file seemed to have a random content assigned.
My theory is that after the migration interruption (i was adding a 4th disk), the recover proces acted like all the data was striped on 4 disks.