Build/Buy a 8 bay (or bigger) NAS and stuff it full of 20TB HDDs, run the HDDS in RAIDZ2 or RAID6 depending on what you end up with.
Why not look into alternate methods of getting alerts? Like Gotify or ntfy?
You could do your ideal scenario with LVM or with linux mdraid.
I'm not too familar with ZFS so not sure if you could do it on ZFS.
It's the multicoloured headers that are to the right of the cap next to the usb port.
This is a software issue anyway with this Realtek NIC.
Not the first time it's happened so I have mitigations in place, unfortunately because I shuffled some VMs around yesterday due to a power outage, the mitigations failed. That has since been sorted.
Sure, but nowhere near as often.
This is a i7-8700 on an Asus Prime H310M-E motherboard.
All I could afford at the time unfortunately.
Really depends on whether you're more comfortable with a WebUI or Command line.
pfSense CE is still perfectly fine, and a lot of features that are behind the paywall are more for commercial users, less for homelabs/home users.
If you are still worried, then Opnsense is a pfSense alternative that's built from the same base as pfSense as it was forked from pfSense a few years ago.
Also, you won't be able to run Proxmox on the Pi. There is Pimox, but I don't know how that would behave if it was in a cluster with Proxmox.
Look at the system requirements for whatever software you want to use?
Do everything in this post - https://www.reddit.com/r/sysadmin/comments/3z7qd9/comment/cyjynxh/ - with your homelab.
Then you can say you have some experience managing AD etc etc.
Depends on what functions your pfSense box is currently serving.
Proxmox with Proxmox Backup Server will do most of that if you were willing to move of CentOS Stream and onto Proxmox.