Easus is a good one but if you want one that does it best without jerking you around open your purse and buy Acronis. Spending some now will prevent future headaches. Right now if I could...I'd spend the bucks and do it up right the first time because later on you might regret it. Just saying!

What he said. 

If they're networked you can backup across the network.

If they have the same folder tree [OS] you can use the same setup/config for all of them.

If not you can copy the config to other machines and edit as needed.

Ultimately it is one config per machine....and the same applies to ANY backup software...

Thanks guys.

If there's ANY personal or financial data involved, DO NOT use a cloud backup.

While tempting because of your personal circumstances at the moment, any breach of that service will put whatever in the hands of bad people. That said, CloudBacko states it uses military grade 256 bit encryption ("truly randomized").

I would only point out that frequently, buisnesses offer "unlimited" when in fact, it means "unlimited so that you put all your stuff here, but we have plans to change that in the future." A "bait and switch", if you get my drift.