How to transfer a Time Machine backup to another backup drive

Earl Jarrett asks a question many people have about Time Machine backups. He’s currently using a 1TB external drive and wants to upgrade to a new 4TB drive. Time Machine can keep a deep history of your previous versions, and the more space, the deeper the history, which has led many people to upgrade the storage they allot to these bakcups.

How do I transfer the info from the 1TB external drive to a new 4TB external drive and use it with Time Machine, and then wipe the 1TB drive and use it to run Photos while making sure that any new pictures are backed up as well?

It’s fairly easy, but requires that you perform a number of actions in the right sequence to ensure no backups are in progress while you’re copying.

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