IORegistryExplorer is known as IOReg. To make a copy of IOReg, follow the steps below.Firstly, download IOReg.
Extract the .zip and copy it to your Applications folder.
Then, open it up.
Now you can make a backup copy of the Registry.
Click on File, Save a copy as, find a folder that is comfortable for you and save it, and you're done!
Note: You can get IOReg from here
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