QuickFix: Build pipeline failing at 'Prepare for Build' step

[This is my own experience which worked for me. Pay attention to other troubleshooting as well like checking for any error on other steps, checking event viewer etc]

Issue: Build pipeline failing at step of 'Prepare for build' or it's taking a very long time, it's stuck at the below step,

/LOG:"C:\DynamicsSDK\VSOAgent\_work\1\s\Backup-AX7Packages_RoboCopy.log"

Solution: If you read the previous steps carefully it may give you some more details something like the below, 

If you RDP to your build machine and check for the folder delete this from the Build machine and try to run the pipeline, if should create this from scratch. 

/LOG:"C:\DynamicsSDK\VSOAgent\_work\1\s\Backup-AX7Packages_RoboCopy.log"

/LOG:"C:\DynamicsSDK\VSOAgent\_work\1\s\Backup-AX7Packages_RoboCopy.log"

/LOG:"C:\DynamicsSDK\VSOAgent\_work\1\s\Backup-AX7Packages_RoboCopy.log"/LOG:"C:\DynamicsSDK\VSOAgent\_work\1\s\Backup-AX7Packages_RoboCopy.log"

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