SQL Backup is more than 12TiB, you can choose to backup using Azure File Share
Standard file shares can span up to 100 TiB, however this feature is not enabled by default. If you need a file share that is larger than 5 TiB, you will need to enable the large file share feature for your storage account.
Premium file shares can span up to 100 TiB without any special setting, however premium file shares are provisioned, rather than pay as you go like standard file shares. This means that provisioning file share much larger than what you