Backup and recovery from an external hard-drive to another

Hi sirs/madams,
I have two external hard drives and one of them is acting really weird, lagging and it became so very very slow compared to before.
So I want to back everything up in it into the other external hard drive, I wanted to used the Disk Utility but got scared, didn't want to play with it and then lose all the work of two years.
So the question here is how to backup all the data from hard drive 1 to hard drive 2 and then recover the data back from hard drive 2 to hard drive 1?
Thanks in advance.

sara-alain wrote:
You're kidding, right?
1.2 TB of data will take nearly 10 bloody hours to be moved into another HDD.
Please give me a professional solution
A 'professional' solution? All retina MBPs have Thunderbolt capability so use that to transfer data. It will reduce transfer time by 50% or more depending upon what protocol you are using. If your MBP has Thunderbolt 2, the transfer times will be twice as fast as 'plain' Thunderbolt.
Ciao.

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Backup and recovery from an external hard-drive to another

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