External hard drive for my direct tv dvr - DirecTV

I have a directv dvr model HR54-500
I want a external hard drive. The guy who installed said I need a Western Digital external hard drive. With no more then 2 tb. With a esata p cable.

My 2 questions are... What model do I need? And Can I use one of the ones that backs it up on the cloud so that if my dvr crashes I still have access to those program saved to the cloud? (as long as I get another dvr and compatable external hard drive) ?

And just so you know... lol I'm not very tech savvy so super clear instructions are always helpful.
Thank you.

This question, "External hard drive for my direct tv dvr," is about DirecTV channels, programming, equipment, and sports.

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