Another observation: I changed the names of two hard drives when I upgraded from Leopard to Snow Leopard.
Backup HD became SnowLeopard HD (and I upgraded my backup after making a fresh clone) while Leopard HD became the new Backup HD. Yet, the TTP preference pane showed Leopard HD and Backup HD. I assume that TTP's interpretation of those names refers to the old drives, which have been renamed. I experimented and solved the recognition problem by trashing ~/Library/Preferences/com.micromat.techtoolpro5.plist When I went to the TT Protection preference pane, the correct hard drive names were there. I won't trash the /Library/Application Support/TechTool Protection until I either hear from Micromat privately or MMT3 replies in this thread.
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P700, Photoshop CC, Lightroom CC, MS Office 365
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