Azure Storage Details
Q: How much can a single storage account hold?
A: Each Azure storage account can hold 500 TB per account
Q: How many storage accounts can a single subscription have?
A: Each subscription supports up to 50 storage accounts (so 500 TB * 50 = 25 Petabytes)
Q: Can I have my app write to a non-transient storage a treat must like an SMB file system?
A: Yes, use Azure File Storage (https://azure.microsoft.com/en-us/services/storage/files/)
Q: What is your source for all this info?