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# Necessary system state {#ch-system-state}
Normally — on systems with a persistent `rootfs` — system services can persist state to
the filesystem without administrator intervention.
However, it is possible and not-uncommon to create [impermanent systems], whose
`rootfs` is either a `tmpfs` or reset during boot. While NixOS itself supports
this kind of configuration, special care needs to be taken.
[impermanent systems]: https://wiki.nixos.org/wiki/Impermanence
```{=include=} sections
nixos-state.section.md
systemd-state.section.md
zfs-state.section.md
```
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