Yahoo Account Data Migration and Deletion

Yahoo email data can only be backed up via something like connecting it to Thunderbird and going the POP method.

From there, you should be able to make a zip archive of those emails… if you have been a heavy user for a long time, you may have several GB worth of emails and attachments, so the transfer and archival processes will likel take a fair amount of time, expecially if you have a slow internet connection.

Deleting your Yahoo! Account and data:

1. Visit Yahoo!’s Terminating your Yahoo! Account page.

2. Log in with your Yahoo! Account.

3. Type in your password to confirm your identity.

4. Type in the CAPTCHA code to confirm your humanity.

5. Click YES to delete your Yahoo! account. You’ll see a confirmation page if you successfully deleted your account.