wtf is azure-storage-azcopy?

AzCopy is a free command-line tool from Microsoft that moves large amounts of data in and out of Azure Storage. Think of it as a heavy-duty moving truck for your files: instead of clicking through a web portal to upload or download files one at a time, you type a single command and AzCopy transfers entire folders or directories at high speed. It also handles server-to-server transfers, meaning you can move data between cloud providers like Amazon Web Services (AWS) or Google Cloud Platform (GCP) directly into Azure without downloading files to your local computer first. The tool works through simple text commands like "copy" or "sync." A copy operation grabs everything at your source and moves it to the destination, which is great for straightforward migrations. Sync, on the other hand, compares both locations and only transfers new or modified files, functioning like incremental backup software. If a transfer fails midway through, AzCopy can resume the job from where it left off, saving you from starting over on massive data sets. This tool is built for anyone who needs to move serious volumes of data into or within Azure. A startup migrating terabytes of user-uploaded videos from AWS to Azure Storage would use this to avoid a manual, multi-step download and re-upload process. A data engineer might use the sync command to keep a local backup folder matched with a cloud storage container. IT teams performing periodic backups or migrations can also automate these commands to run on a schedule. Notably, AzCopy gives you fine-grained control over file overwrites. By default, copy operations will overwrite existing files at the destination, while sync uses the last-modified timestamp to decide whether a transfer is needed. You can toggle these behaviors with simple flags if you want stricter control. The tool also supports performance benchmarking, letting you test your transfer speeds before committing to a large migration.