with 2TB drive. My first MBP after ~ 10 Thinkpads. Time Machine drive = a shiny red Seagate 4TB Backup Plus external hard drive labeled "MyTimeMachine" I've never felt confident in this Time Machine thing. Time Machine did not work until High Sierra. Known bug. With High Sierra, the Time Machine backup completes fast enough. But I've had to remove the external drive after several days before encryption completed. This is the longest my patience and time has held out. At this rate it will take more than a full week to encrypt < 1.5 TB. Why is it taking so long.