Update installation.md

docs/markdown/installation.md

@@ -8,4 +8,18 @@ Autorestic requires `curl`, `wget` and `bzip2` to be installed. For most systems
 curl -s https://raw.githubusercontent.com/CupCakeArmy/autorestic/master/install.sh | bash
 ```
 
+## Alternatives
+
+### Manual
+
+You can download the right binary from the release page and simply copy it to `/usr/local/bin` or whatever path you prefer. Autoupdates will still work.
+
+### Brew
+
+In the pipeline, see the [issue](https://github.com/cupcakearmy/autorestic/issues/58) for status.
+
+### AUR
+
+If you are on Arch there is an [AUR Package](https://aur.archlinux.org/packages/autorestic-bin/) by @n194.
+
 > :ToCPrevNext