It's really worth considering hosting an instance on a platform like PikaPods which makes it suuuuper easy to setup and you'll have a free subdomain as well so you can access it from anywhere, any time. They have wonderful backup procedures, update procedures, and they're very cheap. Worth considering if you wanna use Paperless but not deal with any of the hassle. Highly recommend.

Small note, I host my Paperless instance on my home server so it's local. This is for a few reasons. But I do use PikaPods for Baserow which I use for a few non-critical work things and I love the platform. You get $5 free to try it out with no credit card so you really can't lose anything by trying.

Bookstack is such an amazing tool. Just make a shelf for Homelab, books for each aspect like VMs, docker, etc. Then have a chapter for each VM or app and them pages can be installation, running, issues, troubleshooting, significant upgrades, etc. It's important to actually take note of it all and not just grab URLs for your resources because if those pages are removed then you're screwed.

Cloudflare Tunnels are absolutely the way to go.