Hi,
When you create a new application key, you will be shown the KeyId, KeyName and applicationKey. The applicationKey is shown only once.
In UpdraftPlus, these map to the following settings:
Application key – applicationKey that was generated
Bucket application key ID – keyID for the app
The ‘Account ID’ setting should be set to your Master Application Key’s ‘KeyID’.
The master application KeyID is the same as your account ID (The Backblaze portal used to show a link to display the account ID, but this appears to have been removed).
Please let me know if you encounter any further issues.
Regards,
Bryle