A backup solution towards an USB drive (#2528)

You can add this one under the backup category too.

source/_docs/ecosystem/backup/backup_usb.markdown

@@ -0,0 +1,99 @@
+---
+layout: page
+title: "Configuration Backup to USB drive"
+description: "Instructions how backup your Home Assistant configuration to USB stick"
+date: 2017-04-29 11:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+---
+
+Backing upyour Home Assistant configuration to USB.
+A good plus side is that you don't need to mask all your passwords since the backup is locally at your home/residence.
+
+### {% linkable_title Requirements %}
+
+First you need a USB stick. Once you have one you need to prepare it to be used on your device. 
+Once connected you want to format/work with the drive. To know what path it is in, you can check with dmesg. 
+
+```
+root@hassbian:/media# dmesg|grep sd
+[    0.909712] sdhci: Secure Digital Host Controller Interface driver
+[    0.916414] sdhci: Copyright(c) Pierre Ossman
+[    0.923366] sdhost: log_buf @ bac07000 (fac07000)
+[    0.989001] mmc0: sdhost-bcm2835 loaded - DMA enabled (>1)
+[    1.049095] sdhci-pltfm: SDHCI platform and OF driver helper
+[726257.743301] sd 0:0:0:0: Attached scsi generic sg0 type 0
+[726259.184810] sd 0:0:0:0: [sda] 124846080 512-byte logical blocks: (63.9 GB/59.5 GiB)
+[726259.185603] sd 0:0:0:0: [sda] Write Protect is off
+[726259.185613] sd 0:0:0:0: [sda] Mode Sense: 23 00 00 00
+[726259.186432] sd 0:0:0:0: [sda] No Caching mode page found
+[726259.186445] sd 0:0:0:0: [sda] Assuming drive cache: write through
+[726259.206085]  sda: sda1
+[726259.209004] sd 0:0:0:0: [sda] Attached SCSI removable disk
+```
+
+Here we see we have a drive on /dev/sda1. We assume you created a partition on the drive to start with. This can be any type of partition. Preffered is a linux one so you can set permissions!
+Mount the drive (as root) to /media
+
+```
+root@hassbian:~# mount /dev/sda1 /media/
+```
+
+### {% linkable_title Prepare USB Stick %}
+Cd into it and create a folder called 'hassbackup' and chown it to the user that runs homeassistant. In my case group and user are both homeassistant.
+```
+root@hassbian:~# cd /media/
+root@hassbian:/media# mkdir hassbackup
+root@hassbian:/media# chown homeassistant:homeassistant hassbackup/
+root@hassbian:/media# ls -al
+total 28
+drwxr-xr-x  4 root          root           4096 Apr 29 10:36 .
+drwxr-xr-x 22 root          root           4096 Mar 22 18:37 ..
+drwxr-xr-x  2 homeassistant homeassistant  4096 Apr 29 10:36 hassbackup
+drwx------  2 root          root          16384 Apr 29 10:18 lost+found
+```
+You can ignore 'lost+found'.
+
+### {% linkable_title Install Dependency %}
+
+In order to preserve space on your drive we use zip. Install that too.
+```
+root@hassbian:/media# apt-get install zip
+Reading package lists... Done
+Building dependency tree
+etc etc etc
+Setting up zip (3.0-8) ...
+```
+
+### {% linkable_title Install & run script %}
+
+Become the homeassistant user and place the following [script](https://gist.github.com/riemers/041c6a386a2eab95c55ba3ccaa10e7b0) to a place of your liking.
+Don't forget to 'chmod +x usb_backup.sh'
+
+Open up the file and change the paths you want to use, then simply run the usb_backup.sh
+```
+homeassistant@hassbian:~ $ .homeassistant/extraconfig/shell_code/usb_backup.sh
+[i] Creating backup
+[i] Backup complete: /media/hassbackup/hass-config_20170429_112728.zip
+[i] Keeping all files no prunning set
+```
+
+### {% linkable_title Crontab %}
+In order for this to automaticly make a backup every night at 3, you can add a crontab for it as the homeassistant user.
+Change below path to where you placed the usb_backup.sh and run the following line.
+
+```
+(crontab -l 2>/dev/null; echo "0 3 * * * /home/homeassistant/.homeassistant/extraconfig/shell_code/usb_backup.sh") | crontab -
+```
+
+### {% linkable_title Auto mount %}
+
+This does not automaticly mount your usb drive at boot. You need to do that manually or add a line to your /etc/fstab
+If your drive is on /dev/sda1, you could add a entry to your /etc/fstab like so:
+```
+/dev/sda1  /media               ext4    defaults,noatime  0       1
+```
+
+Manual: 'mount /dev/sda1 /media'