If Synology is faulty (out of 4 Hard drives), even if 1, 2 or 3 HDD is faulty, there's still the 4th one to back up temporarily. Am I correct in stating such?

6. Vanda Support > Vanda FAQ
Answer: yes. It runs at RAID 5 for 4 hard disks. RAID 5 mean 1 hard disk use it as backup to standby. 

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