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.