Update readme

README.md

 
 You can run Freedombone on an old laptop or a single board computer. See the [list of installation methods](https://freedombone.net/installmethods.html). You can also use it to [set up a mesh network](https://freedombone.net/mesh.html) in your local area.
 
-Check out the [list of available apps](https://freedombone.net/apps.html) and [Frequently Asked Questions](https://freedombone.net/faq.html) section. Recent developments are also described on [the blog](https://blog.freedombone.net/tag/freedombone).
+Check out the [list of available apps](https://freedombone.net/apps.html) and [Frequently Asked Questions](https://freedombone.net/faq.html) section. Recent developments are also described on [the blog](https://blog.freedombone.net/tag/freedombone). You might also wish to know how to [backup and restore the system](https://freedombone.net/backups.html).
 
 Disk images which can be cloned straight to USB or microSD drives are [available here](https://freedombone.net/downloads/v31).
 
-If you find bugs, or want to add a new app to this system see the [Developers Guide](https://freedombone.net/devguide.html) and [Code of Conduct](https://freedombone.net/codeofconduct.html). There is a Matrix chat room available at *#fbone:matrix.freedombone.net* and an XMPP channel at *support@chat.freedombone.net*.
+If you find bugs, or want to add a new app to this system see the [Developers Guide](https://freedombone.net/devguide.html) and [Code of Conduct](https://freedombone.net/codeofconduct.html). There is a Matrix chat room available at *#fbone:matrix.freedombone.net* and an XMPP channel at *support@chat.freedombone.net*. The XMPP channel requires membership which you can ask for via [these contact details](https://freedombone.net/support.html).
 
 If you like this project and want to support continued development then [here's what to do](https://freedombone.net/support.html).