TechToolProtection notified me that my Time Machine disk has only 15% available space. In the past, I have erased the disk and redone TM, and that is what I intend to do. I have forgotten how to format the disk for TM. Should it be Mac OS Extended or APFS? I recall that the former is correct but it has been a few years since I had to do this. Disk Utility lists Mac OS Extended as the default for erasure.
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 P600, Photoshop CC, Lightroom CC, MS Office 365
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