Step-by-Step Guide to Creating a Backup Before Flashing ROM

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Before flashing your ROM, use Google One to create a backup; also, follow before and after flashing tips for best results.
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Before you flash a ROM on your Android, there are some things you need to remember to include in your backup. You'll also need to install some essential Google apps first to enjoy your custom flashed ROM . This wikiHow tutorial shows you how to use Google One to create a backup before flashing your ROM, along with pre- and post-flashing tips.

Things You Should Know

  • Make sure you have backup codes for Google Authenticator if that's installed.
  • Get PINs from secure apps like Signal.
  • Take screenshots of your app drawer to see what you need to install.
Section 1 of 3:

Pre-Flashing Tips

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    You got the codes when you set up the app, but if you don't have access to them now, you can follow the steps to export and import Google Authenticator on your "new" phone (the flashed phone, in this case, is considered your new phone). [1]
    • Open the app, tap the three-line menu, select Transfer accounts > Export accounts , and save the QR code to a cloud service, like Evernote, that you can sign into and use to import the saved QR code. [2]
    • In place of Google Authenticator, apps like Authy, Bitwarden, KeePass are cloud-based and can work through backups without needing backup codes.
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    Launchers like Nova, Holo Launcher, and GO can be fully customized so you can easily spend hours getting your phone to look exactly how you want it to look. However, that will all go away when you flash your ROM, so make a backup of your launcher's settings. Your launcher will have the option to back up in the Settings menu.
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    Apps like Signal, which protect your texts with encryption, require a PIN to sign in, so remember to grab all the needed sign-in info for your apps!
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    Swipe up from the bottom of your screen, and you'll see what apps you currently have on your Android. Take screenshots so you remember any apps that aren't installed with your backup.
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    Some people have experienced issues trying to download vaccination apps if they have a custom ROM. In this case, get a screenshot of your vaccination card before you flash the ROM! Other apps with specific security settings may not work on a custom ROM, so do a quick Google search for your banking app to make sure you will still be able to use it. [3]
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Section 2 of 3:

Backing up with Google

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    Swipe down from the top of your screen and tap the gear icon or the app icon that features a gear.
    • Most ROMS are Android, so you most likely want to use Google to back up your current data and set up your flashed phone or tablet.
    • Included in your Google backup:
      • App data
      • Call history
      • Google Account data (like Contacts and Calendar)
      • Settings
      • SMS messages
      • Photos and videos
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    It's next to a "G" icon on a blue tile.
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    You'll see this near the middle of your screen.
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    Google One offers 15 GB of storage for free, and you can see how much room you're using at the top of the page under "Account storage."
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Section 3 of 3:

Post-Flashing Tips

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    Some custom ROMs don't have Google apps, like the Google Play Store, pre-installed, so you'll need to use your computer to get them.

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      References

      1. ↑ https://support.google.com/accounts/answer/185834?hl=en&ref_topic=2954345&sjid=11613851187034859962-NC#zippy=%2Cuse-backup-options
      2. ↑ https://support.google.com/accounts/answer/1066447?hl=en&co=GENIE.Platform%3DAndroid
      3. ↑ https://www.reddit.com/r/LineageOS/comments/qpmt34/dont_be_me_backup_your_shit_before_flashing/

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