You need to copy all data from an existing Azure Storage account (many containers and large volumes) into a new storage account. The migration must be automated, require minimal user interaction, and be recoverable if interrupted. Which tool or approach should you use?

AzCopy is the most suitable tool for this scenario because it's a command-line utility designed for high-performance data transfer to and from Azure Storage. It supports automated, scriptable operations, which is crucial for minimal user interaction. AzCopy also offers robust restartable transfers, meaning if an operation is interrupted, it can resume from where it left off, ensuring recoverability. Azure Storage Explorer is a GUI tool, less suitable for automation. The Azure portal is also a GUI and not designed for large-scale, automated data migrations. The .NET Storage Client Library would require custom code development, which is more complex and time-consuming than using AzCopy for a straightforward copy task.