update install / backup documentation

docs/install/backup.md

@@ -8,16 +8,43 @@ parent: Install
 
 ## Backup
 
-The following commands should be valid for every setup (docker/debian/sqlite/postgres) but check your installation directory first.
-This includes database, configuration, custom user locales, logs, images and thumbnails.
+The following commands should be valid for every setup (docker/debian/sqlite/postgres).
 
+1. Move to gancio path
 ```bash
-cd /opt/gancio/ # or /home/gancio or where your installation is
-tar  -czf gancio-$(date +%Y-%m-%d-%H%M%S)-backup.tgz  \
-  $(ls -d config.json uploads user_locale db.sqlite postgres data logs 2> /dev/null)
+cd /opt/gancio/ # or where your installation is
+```
+
+1. Backup PostgreSQL (only required for non-docker PostgreSQL installation)
+```bash
+sudo -u postgres pg_dump -Fc gancio > gancio.dump
+```
+
+1. Archive database, configuration, custom user locales, logs, images and thumbnails
+```bash
+sudo tar -czf gancio-$(date +%Y-%m-%d-%H%M%S)-backup.tgz  \
+  $(ls -d config.json uploads user_locale db.sqlite gancio.dump postgres data logs 2> /dev/null)
 ```
-> warning "Permission denied"
-> `postgres` directory could have different permission or owner, in this case you need to be root or use `sudo` instead.
 
 > info "Automatic backup"
-> To periodically backup your data you should probably use something like [restic](https://restic.net) or [borg](https://www.borgbackup.org/)
+> To periodically backup your data you should probably use something like [restic](https://restic.net) or [borg](https://www.borgbackup.org/)
+
+
+## Restore
+
+1. Install a clean gancio
+1. Move to gancio path
+```bash
+cd /opt/gancio/ # or where your installation is
+```
+
+1. Extract your backup
+```bash
+tar xvf gancio-*-backup.tgz
+```
+
+1. Restore PostgreSQL database (only required for non-docker PostgreSQL installation)
+```
+sudo -u postgres createdb gancio
+sudo -u postgres pg_restore -d gancio gancio.dump
+```