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@freddo
Cool. QTS 4.3.4 is very good now.
This is a good explanation of Raid types.
Ideally set this up as Raid 10 but with 2tb drives you'll only get around 3.78TB of usable storage. Make sure you're buying NAS ready drives (you can't just buy regular PC drives) as otherwise they won't play in a Raid configuration at all and will fail fairly quickly. My go to are Western Digital Reds and 4TB or 6TB are best value (I have a TS-869 pro and I'll replace this with a TS-879RU Xeon soon). The WD Reds in there should be good for 5 years in 24/7 use, these have been running for ±2 yrs and have 0 failed blocks. Previous WD reds were fine after 7 yrs, again no failed blocks. In Raid 10 where one drive fails the Raid will remain usable and you won't lose data; you can hot swap the failed drive and the raid will restore data to that disk. Replace failed drives asap as a second failure brings a 50% chance of data loss though.
Plenty of options to back up to cloud or locally. My fave is to rsync to an offsite NAS which can be less powerful and raid 0 configured.
You can run a time machine server on the NAS to backup the iMac and you might like QNAP's download server + VPN. And your TS-451 is fast enough to encode media streams for much fun with Plex.
You'll need to assign a couple of fixed IP addresses to the NAS. How fast is your LAN and wireless router?