Need help in mysql database backup on Windows except mysqldump?
You may give it a try using percona backup alpha version for Windows - Download_Link
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Below are the steps after installation in Windows Bash. 

C:\Users\lorainne&gt;bash

C:\Users\lorainne$ xtrabackup –user=root –password=secret -host=127.0.0.1 –port=3306 –backup –target-dir=\test


I haven't tested this but this seems to be a working command, ensure that you have https://msdn.microsoft.com/en-us/commandline/wsl/release_notes - Build 14332 fixed to have prctl system call supported on Windows.