can anything be done to change backup email?

Hello Rik, this is Manuela!. I'm an Independent Advisor and community user like you ready to assist with this.
Not a Microsoft employee.

I'm sorry to hear you're having trouble with your Microsoft account
May I know what occurs when you try to remove this email from your security information or as an alias?

https://account.microsoft.com/security

https://go.microsoft.com/fwlink/p/?linkid=842796

Hello, you have to change the email of the account, you can not transfer your backups or achievements

If you have a backup email on the account try and rest password and the reset password code will send to your backup email and change the password to your main account

When I try to create a new part in "fable 2", the following message appears: " you have reached the maximum number of backup allowed on this storage device. To create a new backup you need to delete an existing backup or insert a new storage device". All
the backups in the game come from the cloud. I’ve tried to delete the data before. It doesn’t change anything. Backups are always there. Whether I play online or offline doesn’t change anything.

Check to see if you can change your account security settings, such as email backup, from this web site

https://account.microsoft.com/security