Resolve "Mention Backup should be in external device"

TWRP makes `nandroid` backups, which are near-complete images of your system.

- You use nandroid backups to restore your phone to exactly the state it was in when you backed up: the version of Android, your wallpaper, your home screen, right down to which text messages you had left unread.

{% include alerts/tip.html content="Ensure you copy the backup on to an external storage device. Do not make the backup on the same device as in some cases the devices are completely formatted and this will wipe out your backup. "%}

## Flash TWRP on your device

For this document we will assume you have TWRP on your device. If not please refer [this document](install-twrp)

{% assign install_adb_link = "/pages/install-adb" | relative_url%}

{% assign enable_usb_debug_link = "/pages/enable-usb-debugging" | relative_url %}

# Requirements

- Take a backup of all important data on your phone before proceeding.

- If required take a backup of all important data from your phone on an external storage device before proceeding. 

- Do not take a backup on the same device as some of these actions will format the device and delete the backup.

{%- if device.uses_twrp %}

- A guide on backing up with TWRP is available [here]({{ backup_and_restore_with_twrp_link }})

{%- endif %}