Server 2012 R2, backup question

I have four domain controllers.  I need a backup solution for them.  Each DC has a HUGE E: drive for data so I mapped from one DC to another and was using built in Windows backup to backup one server to another.  The problem is I can't over write and apparently Windows won't delete the oldest backup on a network drive.  So, having four server 2012 R2 DCs, and using only the windows server backup, how can I backup these boxes to one another and over write the backups?

Can I do this from powershell or something?  I already tried editing the backup after it's created and I can't add or edit a switch that will make it over write, but I sure do need a solution.

Thank you

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Run out to google and look at veeam endpoint backup, it's free and does a great job.  Very easy to restore as well.
Blake LongEngineerCommented:
Windows has many great built in utilities, but backups is not one of them. I typically steer clear of Windows Backups. I have had many situations where a client had windows backups and has lost significant amounts of data due to windows backups being inadequate. I would especially not backup directly to another server, Windows backup is not designed to work this way. At the very least I would backup to external hard drives.

That being said, I found this article:

I also agree with the previous comment that there is better free backup software out there if you look around.

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Windows Server 2012

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