Old data on new device

Hello.
How can I ensure that users of the application store their own recorded data with a username and password they determine, and that even if they reinstall the program on another device, they can retrieve their old data when they enter their password and username? Can we use Google sheets?

instead of google sheets you should use firebase

You can use google sheets for this. Passwords should be hashed to store on your server (google sheet), then tested when user signs in.

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Here's an example

Really?

When would tag come back as 'not_found'?

Sorry there was a mistake if value = not_found

For example, A1 columns are for the username; B1 columns are for passwords; Can columns C1,D1,E1,F1... also be used to store user's data? Thus, whichever line the username and password are entered, the other data in that line is transferred to the application. What do you think, is this possible?