best way to backup hyper v DC & SQL & Exchange

im running server 2012 in hyper v role
I have a virtual dc sql and exchange server
I need to backup these servers
I was going to buy a 3TB usb drive and backup all servers to this
can this be done or do I need to attach separate drives to each virtual server
what is the easiest least expensive way to backup /restore these servers
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dougdogAsked:
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ktaczalaCommented:
Haven't tried it but always heard great things about Veeam:

http://www.veeam.com/virtual-machine-backup-solution-free.html
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dougdogAuthor Commented:
has anyone any other solutions?
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Akash BansalIT ProfessionalCommented:
Yes the bare metal back can be done on USB.
Best if you have USB 3.0 port in ur server.
You can buy USB 3.0 card for ur server.
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