How is the RAID setup? With 5 drives it could be RAID 5, 6, or 10.
RAID 5, RAID 6, RAID 5+hot spare - 4-drive models or above
RAID 6+hot spare - 5-drive models or above
RAID 10 - 4-drive models or above
RAID 10+hot spare - 5-drive models or above
If it is RAID 5 and you had two drives fail you are in for a very difficult time recovering any data.
Have you read these two QNAP articles?
Redundant Array of Independent Disks (RAID)
Hot-swapping the hard drives when the RAID crashes
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