Docs: maintenance section

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+# Debian maintenance

diff --git a/docs/maintenance/offline.md b/docs/maintenance/offline.md
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+# Offline maintenance
+
+## apt-offline
+
+With `apt-offline` it's possible to keep an air gapped machine:
+
+* [GitHub - rickysarraf/apt-offline: Offline APT Package Manager](https://github.com/rickysarraf/apt-offline)
+* [apt-offline - Debian Package Tracker](https://tracker.debian.org/pkg/apt-offline)
+* [apt-offline(8) — apt-offline — Debian bullseye — Debian Manpages](https://manpages.debian.org/bullseye/apt-offline/apt-offline.8.en.html)
+* [apt-offline – An Offline Package Manager | apt-offline](http://rickysarraf.github.io/apt-offline/)
+
+This could be integrated with [git-annex][] allowing for a sneakernet type of
+package distribution.
+
+[git-annex]: https://git-annex.branchable.com/