Are your file server migrations to Azure Files or Azure Blob producing unplanned downtime, due to the transfer window not being designed correctly?

I migrated a 30TB file server to Microsoft Azure while minimizing business interruptions. That outcome requires a specific approach: you don’t move 30TB in one shot during a maintenance window. You seed the data over days or weeks using incremental sync, then cut over only the delta during the actual window.

The tools matter less than the transfer architecture. Whether you’re using Azure Data Box, AzCopy, or Azure File Sync depends on network throughput, data change rate, and whether the destination is Azure Files or blob storage. For file shares where users are still writing during the migration period, Azure File Sync is the right answer because it maintains sync continuity.

The 30TB number is a headline. The actual work is the 6 weeks of incremental transfer that made the cutover window achievable.

What’s your current approach for large file server migrations where you can’t take a full downtime window?

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