Add LineageOS Backup

Guides/5. LineageOSBackup.md

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+# Backing up your Installation
+
+LineageOS uses a builtin tool called Seedvault Backup to create and manage encrypted
+backups of your phone. No root is needed for the following guide.
+
+## Enabling the backup
+
+Go to your settings menu
+
+Find ```System Settings``` - Tap ```Advanced``` -  Tap ```Backup```.  
+
+Here you should find the ```Seedvault Backup``` Option. If not, got to ```Change Backup Provider```
+and tap ```Seedvault Backup```.
+
+Now choose ```Seedvault Backup```.  
+
+Now a list of 12 words should appear. **Write all of the words down carefully**. Make sure you have got them in the right order and store them in a safe place, that is easily accessible to you.
+
+Tap ```Accept Recovery Code```.  
+You might be prompted to re-enter the code.  
+
+Next you can choose, where the backup should be stored.  
+Usually you have the following options:  
+
+* Your phones internal storage
+    * generally not recommended as it fills your storage
+    * also your data are lost if the phone is lost
+* SD-Card
+    * viable option, if you have a large SD-Card
+    * if your phone is gone, so are your data
+* USB Attached Storage
+    * viable option, if you have a large USB Stick or even a drive
+        * may need an adapter to work
+    * data are stored separately from the phone
+* Nextcloud
+    * if you have a nextcloud account, this might be a good option
+    * very slow for large backups
+    * needs a stable internet connection
+
+Once you chose the option best fitting for you.  
+Seedvault will prepare the storage location.  
+
+After this is done, the settings screen will pop up.  
+For the backup actually being effective, enable ```Backup my data``` (or simillar).
+You can choose a few other options as well. I would recommend leaving them at their default (on) as it seems reasonable to me. But choose as you like :)  
+
+It is also possible to choose which apps should be backed up or not. 
+
+Seedvault should now be making backups without further user interaction.
+
+Note: Some apps might not be backed up.
+This can happen when:  
+
+* The app was stopped by the user  
+* The app was never used  
+* The app was used, but reset by user  
+* The app does not allow backups  
+
+## Restoring a backup
+
+When you need to restore a backup:
+
+Option 1:  
+* open your dialing app  
+* enter ```*#*#7378673#*#*```
+
+Option 2:  
+* open a note app, or any text field
+* enter ```*#*#RESTORE#*#*```
+* copy this text
+* open your phone app
+* paste this text into the dial field  
+
+The recovery dialog should pop up.  
+Here you can choose if you want to recover your apps and maybe even your storage.
+The restoration may take a while, be patient.  
+
+### Restoring backup from different locations 
+
+It seems, there are a few options to restore backups, that were initially from another phone. Check this [Github Issue](https://github.com/seedvault-app/seedvault/issues/85) for a start.