How to backup a Time Machine backup drive?
My Mac is backed up on a local Time Machine external drive. I want to backup that drive in the cloud. How can I do this?
iMac 24″, macOS 15.3
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Time Machine doesn't backup to the cloud and the transfer of hundreds of Gigabytes - potentially Terabytes - of data is not practical for the average consumer.
If you want to backup the TM backup, I believe your best option will be to simply use another drive and create a second TM backup on that. Time Machine is capable of using multiple external drives and will backup to any that you setup for its use whenever they are connected to the Mac.
Use Time Machine on your Mac to back up to multiple disks - Apple Support
Savvy users will have at least two backup drives, and keep one off site in case of catastrophe, rotating the drives as schedule allows. For example, my mom lives nearby, so when I see her I bring along her 2nd b/u drive and update it when I get there. I also swap my own 2nd b/u, alternately leaving one then bringing the other home to use between visits.