DAS or another NAS?

I have a MiniPC (Minisforum TL50) which is currently running TrueNAS scale and both the drive spaces have been already occupied with my current setup. Running in RAID 1 (Mirror) and they have setup to do “smart” backups like hashed backups to cloud drive, snapshots. This is good enough for my current data i have.

Now i want to make use of my thunderbolt ports and expand my NAS storage to a 4 bay DAS enclosure ( Maybe 5 bay) for my SO. Maybe buy some cheap drives and have 1 or 2 of them as parity drive and increase my capacity with my current setup. is it something i can do without any problems or am i missing anything ?

Or should i just have any other new NAS setup that supports for both us (I dont want to manage 2 NAS systems - one for each) ?

Which of these will be good and cost effective for my situation ? Please help.

Also please recommend any good enclosures or similar solutions in market that suits my requirements. Thank you.

Thunderbolt 4 dock with multi nvme slots would make sense. (DAS)
I am making a similar setup for myself as well..

Can you share the link of enclosure what u are trying ?

Awaiting more info. from Intel N100 / N150 Mini PCs [ 4+ LAN ] & ITX Motherboards for NAS, Home Servers & Firewalls (OPNsense/pfSense)

If you are considering a NAS, the Ugreen DXP series seem like a good option. I’ve ordered DXP4800 Plus (4 Bay) from Alibaba. Came to 430 USD incl shipping to India, customs extra.

Indian variant - ACASIS 40Gbps 4Bay RAID Thunderbolt 4 M.2 NVMe SSD Enclosure
Official seller

When I connected an external hd via usb to my mini pc, the other usb peripherals started having connection issues which leads me to believe that these mini-pc usb ports are underpowered for serious workloads.

This may or may not be the case for the minisforum but just one thing to consider.

Finally decided not to go down this path due to from what I found out that truenas scale doesn’t play well with disk connected over ports and its mostly hit and miss with what “kind of” connection it is. was told its better to do traditional connection like PCIe/SATA. no sure how much of this is true but I don’t want risk it. It better to just build an old/refurbished machine and keep adding drives as I require to.