Painless File Backups to Azure Storage

Windows Azure

In my previous post I discussed steps and utilities for backing up Azure SQL Databases in order to guard against data loss due to user- or program-error. Since then I’ve started investigating options for backing up files – specifically those in Azure Virtual Machines – to the same Azure Storage service used previously.

Just like before I was delighted to find an existing app that makes this super easy. The AzCopy utility makes it possible to copy files to and from Azure Storage and local storage, or from Azure Storage to Azure Storage, with a nice set of arguments.

For instance, the following command will copy all of the files in a local folder, recursively, over to Azure Storage. It will overwrite existing files, and it will skip any files that already exist unless the source file is newer. Perfect.

AzCopy.exe C:HereBeImportantThings http://yourstoragename.blob.core.windows.net/yourstoragecontainer /destKey:YourSuperLongAzureStorageKey /S /V /Y /XO

The Azure storage account name and access key can be accessed in the Storage section of the portal, by clicking the Manage Access Keys button at the bottom of the Windows Azure Portal.

Azure Storage Information

This command took under a minute to backup 3,000 files to Azure Storage from an Azure Virtual Machine. From there I can keep running the command and it will only copy new files over to Azure Storage, overwriting any existing file.

As in my previous post, my little utility AzureStorageCleanup is a nice companion to this process. I have updated the source on Github to include a -recursive argument, which will remove files within the virtual hierarchy found in blob storage (created by the recursive option in AzCopy).

AzureStorageCleanup.exe -storagename yourstoragename -storagekey YourSuperLongAzureStorageKey -container yourstoragecontainer -mindaysold 60 -recursive

By scheduling AzureStorageCleanup to run with the -recursive option, you can remove old files to keep storage use in-check.

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