04-18-2021, 04:28 PM
If you look at the RAID calculator Synology has, you'll get those answers.https://www.synology.com/en-us/support/RAID_calculatorI started with 2 bay and 6TB drives ... then 4 bay with four 8TB drives, now upgrading to 10+14+14 with a spare bay. I think 4 bay is a good way to go for expansion of you can afford it.