Did you really just format that external disk? Recover its data on macOS with data recovery software.
Method 1
Reovering your files with data recovery software
Step 1:
Download, install and launch the application
Step 2:
Select the disk you want to scan for lost files
Step 3:
Recover your files to a new storage location
Best 3 data recovery software for Mac
Updated 04 July. 2020
Method 2
Recover lost files that you have backed up
Step 1:
Launch the applicaiton that you used to create the backups
Step 2:
Find the files to be recovered on the storage media
Step 3:
Restore your data from the storage media
Method 3
Employ a professional physical data recovery service
Step 1:
Pack up your machine and drive to a recovery center
Step 2:
Pace around and hope the recovery is successful
Step 3:
Insert the returned hard drive into your machine and see what was recovered