4 Things to Know About the Synology DS420+ NAS
Regarding the Synology: 1. Four drive bays with no expansion The DS420+ has exactly four bays and no way to add more. This keeps the price lower and the chassis compact, but you cannot daisy-chain extra storage later.
Best for RAID 5 or RAID 10 setups It works well for home-office RAID 5 or RAID 10 configurations. Do not expect to expand beyond those four drives.
Small desktop footprint The chassis is compact and tidy, making it easy to fit on a desk or shelf without taking up much space.
Not for future storage growth If you think you might need more than four drives down the road, look at a model with expansion ports. This one is a fixed 4-bay system.