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Secure NAS server basics
(lemmy.world)
Not sure if this is the kind of thing you’re after, but I think learning a little about the very fundamental pieces of these systems really helps to understand the mechanisms at work.
One place that was really useful to me was years ago, the Security Now podcast did a series called “How the Internet Works” ( I think). Steve Gibson went over all the principles layer by layer and it helped my understanding a ton. This was many years ago, so the rest of each episode is probably filled with really old security news, but the main bits are as relevant as ever.
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.