Time Machine offers a powerful continuous archiving tool for files on your Mac. By design, Apple keeps it simple: it lets you select just a single set of volumes (and excluded volumes, folders, and files) on your Mac for all Time Machine backups, Time Machine can back up automatically only in one of three intervals (hourly, daily or weekly), and whenever Time Machine volumes are plugged in, macOS rotates among them across the specified interval. (For instance, if you have Time Machine Volume A and Volume B and are set to hourly backups, macOS backs up to Volume A at 3pm, Volume B at 4pm, Volume A at 5pm, and so on.)
However, you can gain some control by mounting and unmounting volumes. For instance, say you have a 1TB…