Id recommend setting up a domain even if just for local use. No-ip.com is at least working for me right now (i have free throwaway domain set up there and my router is keeping my dynamic ip dns records up to date so i can wireguard into my router/lan even if the ip changes).

You dont need to expose your services but if you ever do want to, it’s so much easier if youve got a working reverse proxy infront already set up plus you can use https via let’s encrypt certifications inside LAN

Setting up (sub)domains in lan forces you to learn to use a reverse proxy like caddy traefik or nginx. Personally to me NPM(nginx proxy manager) was the easiest to use but i use caddy nowadays. For half a year i didnt expose anything but after wanting to share some albums with the extended family i decided to do so via pangolin hardened with crowdsec running on a virtual private server. Pangolin - while not as easy as tailscale is selfhosted and is very well documented and works well. Then internally, i still have my casdy reverse proxy and certs.

All the services work with the same domain names internally (via the routers dns) and externally. Internally the domain simply points to my severs LAN address. Externally the domain points to my VPS where Pangolin relays my internal domains to the users but adds an extra authentication layer/recerseproxy/access control layer infront. For authentication i use Pocket ID. I can reach nextcloud and access and edit all my documents and other files right there in the browser from any computer which is very convinient.

Im using debian btw and non zfs system, so mileage may of course vary.

Two 4tb disks in raid 1 is a waste of money for most selfhosters. Unless you really want to avoid downtime due to disk failure. (and even then you could get a power outage or a network failure). A second disk will protect you from disk failure but not from other forms of data loss (like you fucking up something and erasing all of your family photos).

Do you also plan to buy some cold storage medium and cloud storage or a remote backup server or something (for 3+2+1 backups)? thats way more important.

Ive got an office pc with a 9th gen intel i3 4 core, 16gb RAM, you can propably find one for 100-200 dollars. Ive installed a 4TB NVMe into it.

For nightly remote backups i have a pi with another 4TB NVMe(overkill for sure, you could use pretty much anything for this) and for cold store i have 4TB external that i plug in when i remember.

I run docker and immich, nextcloud+office, jellyfin + a bunch of smaller services. I could perhaps use a little bit a better gpu for jellyfin transcoding sometimes with certain 4k files. Otherwise no need for upgrades.