First here’s the guide you’ll need to follow to put in the replacement drive MacBook Air 11" Mid 2011 Solid-State Drive Replacement
You will need to upgrade to High Sierra if you are using a NVMe drive as both the systems firmware and OS have the needed updates to support it. Make sure you have the OS installer make sure it’s current
The best way is to make a full TimeMachine backup to an external drive. Once done you can remove your current drive and put in the replacement.
Then, plug in the external drive and when the system starts up press the Option key to get to the Startup manager to select your external so the system boots up.
Once the system boots up you should be able to launch Disk Utility to format your new drive, then run the needed OS installer you got from the App Store.
At the end of the OS install process you will be asked if you have data that’s needs to be migrated. Simply say yes, the installer will locate the TimeMachine image on the external drive.
There is no cloning or mirroring apps needed! And frankly they don’t work anymore with APFS volumes you are now running.
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