Usually, one device doing both compute and storage most people’s use cases better. If you want multiple compute nodes, because you want to be able to reboot one for updates without taking down services, or you want to run real kubernetes, then three compute nodes and one NAS for storage makes sense.

1. You are going to find people who have done both. A lot of NAS devices run kind of low powered CPUs so separating it out into two devices can get you more compute power than a single device. For example, an old as the hills file bay may cost next to nothing, and then using your “last” desktop will get you a lot more storage and compute than a 1500$ modern NAS, but it’ll take up more space, cost more in electricity to run, and make more fan noise. This is the route I went. A modern NAS should be able to run what you listed though.
2. TrueNAS scale is all about storage, but it lets you also run containers. Proxmox is all about virtualization, but you can then run a storage solution inside a VM or container. It’s not the kind of thing you’re going to get a right answer for because either way can work. Both are well-documented, capable solutions. I have tried both at times, but I had a lot more experience with Proxmox by the time I deployed TrueNAS, so I stuck with Proxmox and use a TrueNAS box (bare metal) for backups. It really is a matter of preference.
3. If you have a MiniPC and NAS as separate devices, you will want to set up a network share, so you can seed on the MiniPC the copy that’s on the NAS. My seeding, Jellyfin, Plex, etc, all happen in a virtual hard drive mounted in a separate container from the services. Each of the services "see that drive as a network share despite being hosted on the same physical hardware.

1. It depends of what you want as future proof (expansion capabilities). Usually home user nases come with low power cpu, a high power cpu usually is a enterprise grade nas, really costly for a home user. So having it separated makes the cpu upgrade easy but now you have 2 boxes. But if your terramaster comes with a decent cpu I don’t see any problem.

2. True nas scale is really a behemoth able of almost everything. I would start with something more reduced like omv or unraid. You really don’t need the advance enterprise features of that and it will add only complexity to the setup.

3. If you use NFS for exporting folders from your nas, the “computing box” will see this as a local folder, so no need to have 2 copies of the same file.

Hope it helps

My suggestion is either to use one device, that has a decent enough GPU for transcoding, to do everything or a separate NAS drive purely for storage and a separate PC with that GPU capability for jellyfin/plex + Immich. Home assistant and arr aren’t that resource hungry. Also go for Usenet instead of torrents. Good luck and happy sailing.

1. I’d DIY it, so all on one device. I use an old PC (way overkill) and added some drives, and it does everything I need.
2. Probably? I don’t know much about it, I just use a regular server distro. As long as it gives you enough control to run docker/podman or bare metal services, you should be fine.
3. If your network between the NAS and mini-PC is fast enough, it should work to seed over the network.

i already learnt so much by reading posts in this community

That’s the best way to learn. Embed yourself in a community and passively learn. When you have enough of the vocabulary to ask an intelligent question, ask and let the community present solutions. Good job.

1. Others may disagree, but I think a sufficiently powerful NAS can absolutely handle automation backends and media servers. I know many people run such tools on Synology devices without issue (Synology, however, have become greedy assholes wrt requiring their own drives for compatibility) including me. I haven’t used Immich, but I see no reason that couldn’t run there as well. A dedicated mini-PC is overkill, but it would make things snappier if you’re flush with cash. I’m currently running an M2 Mac mini for my server needs and torrents because I can afford it and it can support 2000+ torrents at the same time without breaking a sweat.

2. I haven’t used TrueNAS and I’m unqualified to comment on this. I have run Proxmox, but not as a container. I’ll let others comment.

3. I haven’t used the Arr Suite. I just searched and I can’t imagine any reason why you couldn’t run the torrent client on a dedicated device and store data on the NAS. You don’t need to duplicate the files to do so. You might have to create automation of sorts to mount the NAS volume on the mini-PC at login or restore it if it gets interrupted, or you could just do so manually.

Welcome to selfhosting. It’s a fun hobby.

I would recommend DIYing your own NAS/server, if possible. How much storage are you needing? What’s your budget?

Like you I lurked the self hosting communities until I made the dive myself. I bought a used HP Elitedesk Mink 800 G3, not a particularly powerful machine, and installed Ubuntu server. I started playing around with docker compose detuos for various services and eventually committed to running immich, qbittorrent, and Plex on it, along with hosting some dedicated servers for various games depending on what I felt like playing at the time. It all worked easily enough and I figured out things as I went along such as domain names (ddns), security hardening, and reverse proxies.

I picked it up around 100 euro, got a secondhand switch so I could have both my PC and it on the same line from the house router to my office.

I have two of them now so I can split game servers onto their own machine to save rrsourcss, and recently also picked up a Seagate expansion drive of 10Tb to use for media storage for the originak one. Still lots to learn, but that’s the fun!

Hardware wise I’d go AIO. A mini and a pair of mirrored USB drives is my setup. I have an off-site backup running: another mini + USB. Finally, I have an inherited laptop as a redundant network box/local backup/immich compute. I have 5 households on my network, and aside from immich spiking in resources (hence the laptop), I have overhead to spare.

An n100 mini (or n150, n200, whatever) is cheap enough and powerful enough for you to jump in, decide if you want to spend more later. They’re small, quiet, reasonable Value for Money, easy Wife Acceptance Factor, and can age into a bunch of devices if you decided self hosting isn’t for you. I’d make a retro console out of any spare mini.

This way, when spending £x00s on a server, you’ll have some idea on what you actually need/want. The n100 can the age into a firewall/network box/local back up/etc if/when you upgrade.

All that said. An AIO storage-compute box is where I’m headed. I now know I need a dedicated graphics card for the immich demand. I now know I want a graphics card for generative AI hobby stuff. I know how much storage I need for everyone’s photos, and favorite entertainment, permanent stuff. I know how much storage I need for stuff being churned, temporary stuff. I now know I don’t care about high availability/clusters. I now know… Finally, the ‘Wife’ has grown used to having a server in the house: it’s a thing I have, and do, which she benefits from. So, a bigger, more expensive, and probably louder box, is an easier sell.

I am currently moving from a Synology DS920+ to using my Mac Mini M4 + DAS with hardware RAID. The Synology is great, but I want to get away from the proprietary RAID that it’s using. I was running Plex on it, as well as all my *Arr’s etc via docker, but Plex and all of these services on the Mac Mini run like greased lightning compared to the Synology. Sonarr/Radarr load instantly versus taking a minute to load the library on the Synology.

I think doing it this way rather than an all in one device is easier to maintain and upgrade. Run all the services in docker so you can make them on any device that you might upgrade/change to, and just have a big RAID array of drives. Plus this way I can use Backblaze personal and backup the entire 50TB for like $99 a year :|

I virtualized my nas for memes but honestly you don’t even need to do that. Just run proxmox and use zfs then build whatever lxc/VMS you want on top of it

openmediavault and casas are good noob-friendly OSes for NAS purpose. Much faster and simpler to get it running than some Proxmox and True NAS overkill solution.

You can also just install whatever Linux OS you like, and plug-in some screen, keyboard and mouse and do your setup this way, like any other computer!

For Hardware, I recommend to build a computer out of standard parts. For what you said, a small motherboard with an integrated Intel N100 CPU and a nice looking case like the Jonsbo N2 will sever you well. This is very close to my current setup, using an older j5040 CPU and it runs everything just fine with no effort (Jellyfin w/ light transcoding, *arr stack, Usenet and torrent clients, syncthing, SMB and NFS filesharing, and more)