Types of disks you can use with Time Machine on Mac - Apple. I used these helpful instructions from SuperDuper to partition part of my external drive to also backup with Time Machine: I wish Apple would standardize formats with the OS and Time Machine, I spent a lot of time trying to set this up. After some research I discovered Time Machine only uses the old Mac OS Extended (Journaled) format. The external hard drive didn't appear as an available drive. Main Question: Would my Time Machine backup be more. After successfully doing a completely new backup I tried to do the same with Time Machine. Two Internal Drives used for macOS, applications, and data: 121GB SSD formatted as APFS (64GB free) 6TB SATA Spinning Rust formatted as Journaled HFS+ (3.6TB Free) One External USB3 Drive used for Time Machine continuously for over five years: 4TB Spinning Rust formatted as Journaled HFS+.

I ran SuperDuper first and found I had to re-format my external hard drive to the newer APFS. I ran SuperDuper first and found I had to re-format my external hard drive to the newer.

I always backup my iMac to an external drive with Time Machine and the great clone program SuperDuper. I finally upgraded to Catalina, I'm still learning some of the differences. I always backup my iMac to an external drive with Time Machine and the great clone program SuperDuper. Catalina APFS file format and Time Machine Mac OS Extended (Journaled) format.

External hard drive time machine format