I keep everything documented, along with my infrastructure as code stuff. Briefly:
edit: plus a few things that do not have a web UI.
I was going to mention ZFS, but I suspect Raspberries are too weak for ZFS?
If you can use ZFS in both sides, send/receive is the bomb. (I use it for my backups.) However, I'm not sure how well encryption would work for your purpose. IIRC, last time I looked at it, if you wanted an encrypted replica, the source dataset should be encrypted, which did not make me happy.
I'd love to work on making NASes "great" for non-technical people. I feel it's key. Sending encrypted backups through peers is one of my personal obsessions. It should be possible for people to buy two NAS, then set up encrypted backups over the Internet with a simple procedure. I wish TrueNAS Scale enabled that- right now it's the closest thing that exists, I think.
The next TrueNAS Scale can do LXC containers using Incus. It's similar to a VM, but more lightweight. You can create a container for any Linux distro and install Borg on that. With previous versions, I googled and found some instructions to run Borg in a container with SSH, or you could use a VM.
Borg also supports dummy SSH targets, that TrueNAS can provide. Apparently, it's lower performance-
Why the choice of TrueNAS Scale? For just a Borg target, you could run any Linux distribution.
YunoHost is a non-profit. Things could change, of course, but I'd fear more that YunoHost dies than it tries to monetize.
TrueNAS is backed by a for-profit company that so far has a good track record and looks pretty sustainable. Plus, while YunoHost might be a bit more troublesome, TrueNAS Scale is pretty much based around "open" things- their app catalog is basically Helm charts, for example.
Docker Compose is quite portable too, but if you are re-using YAML compose definitions from the Internet, or non-official container images by third-parties, there's also risks involved- not everything is easy to migrate! I prefer a very hands-on approach to my personal infra (I package some RPMs!), so I think I wouldn't personally use YunoHost, but I feel somewhat comfortable recommending it to others.
YunoHost is very nice to run on a VPS (or a box at home, or anything). It has good email hosting support, and I feel people without systems administration experience could get it running and host a couple of apps for a group without too much trouble.
TrueNAS Scale has awesome NAS capabilities. ZFS is the bomb. Plus, they are integrating Incus, which I'm a huge fan of. I think it hits a sweet spot for people with systems administration experience. Just install it and you get great NAS capabilities, the option of running a K8S instance, LXC/VM capabilities, and some "app catalog" (I test drove that briefly and it looked decent, but I think less hands-free than Yunohost.). My pet peeve (and I understand why they do this) is that you need separate drives for the OS and for data, so if you want redundancy you need 4 drives- which is likely fine for home use, but I'd like to run TrueNAS Scale on a Hetzner dedicated server, and that increases costs a lot.
If your primary desire is to run a few apps and you want to minimize your learning/effort, I'd check out YunoHost. If you want to do more, but also invest more time, TrueNAS Scale is awesome.
I did some testing with it, because I believe more people should be able to self-host.
I like how it is implemented. It has good support for email. Many apps support SSO.
The critical part to me is how up-to-date applications are. I started a small project to automate version tracking, check out:
https://alexpdp7.github.io/selfhostwatch/app/nextcloud.html
; so for example, the YunoHost Nextcloud app does not lag much behind upstream. My intention with this is to let people see that they have been updating Nextcloud dilligently for two years; they might pull the plug tomorrow, but it's a good track record.
(I'd like to add scrapers to other projects similar to YunoHost. My ultimate goal would be to be able to choose a list of apps you'd like to self-host, and see which projects like YunoHost carry the applications you want, and compare how they track updates.)
Nope, just tested. There are hardware OTP devices that have no Internet connectivity. As far as I know, all OTP protocols are offline-friendly.
My crazy idea is: write software so that Flatpaks can run on Windows and macOS. Plus, make high-quality Flatpak-building templates available for as many programming languages, UI toolkits, etc. as possible.
Because everything that Flatpaks provide is OSS, making shims for Windows and macOS compatibility would be tedious, but doable.
Same with crosscompiling Flatpaks, compared to the difficulties of crosscompiling for Windows or macOS from any other OS, multiplatform Flatpaks should be doable to crosscompile.
So this would lead to a world where a very convenient way to package for Windows and macOS... is creating a Flatpak that works on Linux!
I'm still a huge fan of Ventoy, but lately I have been finding more and more issues with it.
So I decided to investigate using a Raspberry Pi Zero with a USB adapter to create a virtual drive:
It's very wonky and manual at the moment, but I have managed to boot all Linux ISOs successfully so far. Unfortunately, I think only ISOhybrid works OOB, so Windows ISO do not work. I have found some scripts to take Windows ISO and make them ISOhybrid, but haven't gotten around to doing that yet.
I think it should be doable to package this nicely.
Web-accessible Emacs? What are you using?