docs: edit docs

docs/run-as-non-root-user.md

@@ -2,7 +2,7 @@
 
 By default the container runs the backup script as root user. There are few things you need to set to run the container as non-root user if you wish to do so.
 
-You can use the non-root user and group `backuptool` created by the image, uid and gid are `1100`.
+You can use the built-in non-root user and group, named `backuptool`, uid and gid are `1100`.
 
 <br>
 
@@ -26,7 +26,41 @@ chown -R 1100:1100 /config/
 exit
 ```
 
-2. Start the container with proper parameters.
+2. If you want a full backup of the `rsa_key.*`, you need to allow `backuptool` user to read the `rsa_key.*`.
+
+**With Docker Compose**
+
+```shell
+# enter the container
+docker run --rm -it \
+  --mount type=volume,source=vaultwarden-data,target=/bitwarden/data/ \
+  --entrypoint=bash \
+  ttionya/vaultwarden-backup:latest
+
+# make files readable for all users
+chmod -R +r /bitwarden/data/
+
+# exit the container
+exit
+```
+
+**With Automatic Backups**
+
+```shell
+# enter the container
+docker run --rm -it \
+  --volumes-from=vaultwarden \
+  --entrypoint=bash \
+  ttionya/vaultwarden-backup:latest
+
+# make files readable for all users
+chmod -R +r /data/
+
+# exit the container
+exit
+```
+
+3. Start the container with proper parameters.
 
 **With Docker Compose**