Selfhosted
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.
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One "hammer" mitigation to most threats could conceivably face when self-hosting is to never expose your services to the internet using a firewall. "Securing" your services against a small circle of guests/friends/family members in your home network is a lot simpler than securing against the entire world.
If you need to access your services remotely, there are ways to achieve that without permanently opening a single port to the internet such as Tailscale or ZeroTier.
Otherwise, commonly used tools in self-hosting such as Docker or VMs usually offer quite decent separation even if a service is compromised.
Nothing replaces good security hygiene though. Keep your stuff up-to-date. Use secure methods of authentication such as hard to guess passwords or better. Make frequent backups (3-2-1). The usual.