For those of you who want to install custom ROMs on your Android smartphone or tablet, you will want to certainly learn how to backup and restore ROM. This will work on most Android smartphones with TWRP recovery installed including Galaxy Note 4/3/2/1, S5/S4/S3/S2, Note Edge, HTC One, Nexus 6/5/4/7/10, and many more.
You can use ClockworkMod (CWM) or TWRP recovery to do this. In this tutorial, I will use TWRP recovery to make a backup ROM then restore the ROM but CWM recovery should be similar but with different menus.
*Note: If for some reason you don’t have a rooted Android device, you can manually boot into recovery (for Samsung Galaxy devices, power off the phone and hold down Volume Up + Center Home + Power for 5 seconds, for HTC/Nexus devices, power off the phone and hold down Volume Down + Power buttons then select recovery). If you have another device, try googling on how to enter recovery mode.
Step 2. Once in TWRP recovery, choose “Backup”.
Step 3. Choose “System” and “Data”. This will backup your whole OS along with your settings, apps, app data but it will not backup contents of your internal storage/sd card such as personal photos and videos.
(Optional) You can backup ROM to your internal storage, micro-SD card, or a USB flash drive. I recommend using an OTG cable to backup to your USB flash drive (or also you can use OTG USB Flash drive) as backup ROMs can be fairly large (between 1-3GB) and your backup ROM will not take up space on your phone’s storage.
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