Use the command diskutil list to list all the drives and volumes (partitions) and be absolutely sure you understand which disk is which and that you make zero typos or you could clone the wrong thing or worse clone in the wrong direction effectively wiping out your data. If you wish to do it from the command line in Terminal you need to first determine the drives identification. This will effectively clone the partition. In Disk Utility, attach both external drives, select the 2nd external drive where you will be copying the Photos partition to and click on Restore and then select the Photos partition on the first drive. If this is something you need to regularly run as a backup, I would recommend the commercial software such as CarbonCopåloner to make it point and click easy. Some of which depends on the version of macOS you are running as the 3rd party software may only support Catalina or Big Sur on their latest versions. You can clone the Photos partition to the second external drive using Disk Utility (restore function), command line dd tool, or a 3rd party tool such as SuperDuper! or CarbonCopåloner. There's a variety of ways to deal with this scenario. This really has nothing to do with Time Machine. Sounds like you have an external SSD drive that is partitioned for Time Machine and a different partition for Photos and you want to backup the Photos partition to a second external drive.
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