We are migrating from an on-premises virtual machine to Azure cloud. The virtual machine will eventually be decommissioned and we have many files and folders that we don't want to lose, like old websites and databases, scripts, programs etc.
We use an Azure storage account for storing and retrieving images via blob containers for the live websites.
Q: What is the best and most cost effective way to backup large amount of files unused in production, rarely accessed, from an on-premises virtual machine to Azure cloud?