Update readme

nextcloud/README.md

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+# nextcloud
+
+To be added

restic/README.md

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+# restic
+
+## Future improvements
+- Set up with Docker secrets
+- Add notification
+
+## Useful commands
+
+Restoring files on a host where the container is already running via Docker Compose:
+
+```
+# Find the latest snapshot for the current host (note the ID)
+docker-compose exec app restic snapshots -H <HOSTNAME>
+# Restore the given file on the host
+docker-compose exec app restic restore --include /path/to/file <ID>
+```
+
+## Known issues
+```
+Fatal: config or key 2327d55bb96f4cab846b07cc8ffe5906c88c3e657f326a506ccfcf95cd8fd1e7 is damaged: ciphertext verification failed
+```
+
+[Related issue](https://github.com/djmaze/resticker/issues/48)
+
+Do not run both prune and backup at the same time. When initializing, need to run individually.
+
+```
+docker compose up -d backup
+```
+
+```
+docker compose up -d prune
+```
+
+```
+docker compose up -d check
+```