To save your account, you can go to the "Data Transfer Settings" from the Gear icon when you are in-game, then choose "Data Transfer with KONAMI ID". Register a new account if you don't have it yet and bind it to the account.
June 7th update
Recently, there were problems associated with making a KONAMI ID, which has now been fixed, but a new method to save your account is now added as well. You can now set up a data transfer to back up your account using Google Play Games. Simply log in to your Google Play account when you are in-game, and choose "Data Transfer Setup (Google Play Games)" in the Data Transfer Settings.
Setting up a data transfer
1. Tap a gear-shaped icon
2. Tap "Data Transfer Settings"
3. KONAMI ID or Google Play Games
You can link your game data to both a KONAMI ID, or Google Play Games. In case one of them isn't available, you can use the other to restore your data. You can link your game data to a different KONAMI ID, or Google Play Games if you accidentally used a different or wrong account, but it will replace the previous one. If you plan on transferring from using Google Play services to iTunes, make sure you use KONAMI ID instead.
3.5 KONAMI ID
If you are using KONAMI ID, login or generate first before linking your game data to it.
If you did everything correctly, your account is now saved so you don't have to worry about losing it if your phone is broken, a data error or if you uninstall the game. You will have to re-download all of the data files though.
Using your account on a different device
When you want to use your account on a different device, you will need to log in to your account. When you first launch the game, before you tap "INITIATE LINK!", tap the button below for "Data Transfer" and log into your account.
If you set up using a KONAMI ID, simply log in to your registered account that you linked your game data to. If you are using Google Play Services, make sure you are logged in to the right account.
If you lost your account before you managed set up a data transfer, you can try recovering it from the "Contact Us" and "Submit Player Data Recovery Inquiry" from the gear icon in-game.
1. Tap a gear-shaped icon
2. Tap "Contact Us"
3. Read through the description & Tap the button
4. Submit inquiry
You will need to provide your information as accurately as possible for them to be able to identify that it is yours. Simply giving them your player ID is not enough, since anyone can look that up and is not a very reliable information. Try to remember stuff like deck names, latest card obtained of certain rarity or what device you used it on.
Next step is to wait patiently and check your email for a reply from their support team.
When I try recover my data via my Google play ID it is saying "data transfer unsuccessful. Please sign in with the same Google play account you started the transfer with." but when I go to the Google play games app I see all my achievements for duel links. So it must be the same account. What can I do?
Honestly this game has one of the worst account transfer system ever, since it involves making another account on a website, that you will never use other than for the transfer.
Can't they just do it like in Pokemon Shuffle Mobile? You generate a code in the game that's usable for a whole month, then if you change phone during that month, you just download the game on the new phone, click transfer data, use that code, and you get your account on the new phone.
My god.really? I had to manually tell the game to save data to transfer it? Decided to reboot tablet cuz it started glitching in DL...tablet got stuck at bootloader..read that if nothing helps use hard reset [hey, I've used google play acoount...my progress will be fine]...installed Duel links...Data Transfer>Google play>f*ck you mister player,you didn't save progress for transfer
F*ck you Devs for wasting 5 months of my life for this.
The problem I have now is that my account that I have played on steam has been overwritten by the one that had to be created on my phone and now all my progress is deleted.
Is there a way to get my old stage 9-10 account back?