Thanks for your post. I'm not sure I have understood your question correctly. Do you mean, is it possible to overwrite a backup in a SQL Backup Pro Hosted Storage account by uploading another backup with the same name? The answer to this is no: the upload timestamp is appended to the backup file name, ensuring that each file in a hosted storage account has a unique file name. This means that you can upload multiple backups of the same name (eg "mybackup.sqb") to a Hosted Storage account without overwriting older files.
I hope that answers your question. Please let me know if you need more information.
Red Gate Software Limited