Backup of Azure Blob storage

Given that I have a Storage account containing a number of blob storage containers with blobs. How can I assure that it is possible to perform a point in time restore of those blobs for a given retention period? Is there a built-in backup mechanism in place in Azure, allowing to perform it via a support ticket? Are there any best practices for creating a setup allowing it?

The scenarios to protect against is essentially data corruption via overwrite of a blob without snapshots or dropping entire containers. Activating Soft delete and maintaining permanent leases on containers will only get me half way there.