Chance to recover data on RAID 0 is very low... you can try the following:
1. Remove your hotspare drive from the system
2. Insert your accidently removed drive
3. Select the storage pool, and then select "Rebuild"
4. Wait until the rebuild complete
5. Delete the offline virtual drive and recreate it with exact same settings (name, RAID level, size). Do NOT select "Initialize Boot Sector"
6. Assign the new virtual drive to a server and see if the data is still there