How can I take backup in External HardDrive and then reinstall new OS and then restore data from External Hard Drive

I have goot some issue with my Macbook i7, I am not able to start my Macboook its keep showing the Grey screen after login.
I have done something where I have successully taken the OS backup on External Hardrive which was saying computer will start automatically. After this I founded a Fresh new computer but may be that was running on External hard drive.
I am **** confuse what should I do next?
Anyhelp wold be great......

Delete the user account, then use the "Erase Free Space" option in the Erase tab of Disk Utility to write zeroes to the drive. Stick with the "Fastest" method (one pass of zeroes) unless you're hiding secrets from the NSA - anything more stringent is a waste of time.
Matt

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