Containers, Compose, registries and self-hosted deployment platforms such as Dokploy, Coolify and Traefik.
Dokploy runs apps as Docker Swarm services, so rolling updates are already there — they just need a real health check and an update policy. Plus how to prove no request was dropped.
A nightly backup for a self-hosted Docker host: database dumps taken with the right tools, file volumes snapshotted with restic, a systemd timer to run it, and a restore test that proves it works.
Both put a Heroku-style deploy UI on your own VPS, but on different container primitives. What that means for zero-downtime deploys, multi-server growth and the day the control plane breaks.