Question is, what is its Wife Acceptance Factor (WAF)?

Weeeell, there’s a school of though leaning towards the opinion that using VPS is still self-hosting ;)

I think this is the best answer. Separation of concerns and all. And OP can keep using whatever notes app he is right now or even switch to another, without the additional encryption requirement.

Don’t forget to compare a consumption too, or perhaps “performance per watt” metric. If plan to run this CPU in a server, this makes a difference in the electricity bill - especially for always on server.

This is very important distinction to be made. Sync is not a backup.

However, you can get 90% there with Syncthing when you enable file versioning or at least trash can for the files.

This is the approach I try to also follow. It also makes the process of restoration from the backups or migrating to different server much easier.

Draw.io is also totally open and is able to be integrated into many different tools - so chances are your tool of choice already has a plug in for it. For example, nextcloud does.

Oh my, TIL. But what then in cases like these, when the Pihole itself is down? You need fallback…

Shouldn’t you just have a fallback DNS for cases like these? During the outage, it would be the one used and after the things settle, you would be back at primary.

Maybe some kind of monitoring/notifications on top of thatm

It sound like you are personally offended by this because you are Chinese, but as an European, I share your sentiment. I don’t trust either Chinese, nor American solutions. After all, after Snowden, we know American solutions are systematically compromised.