I'm trying to diagnose & fix some problem on my MacBook Pro - the machine randomly hard-crashes instantly & shuts down.
I have a somewhat-old Time Machine backup of the drive on an external USB disk, and I would like to update that backup. The problem is that it keeps crashing in the middle of backups, then forcing a complete disk scan, which takes a really long time, so it never gets to complete a new snapshot.
To try to make progress, I created an external bootable drive, which I can use to get the laptop started. I can also mount my Time Machine backup drive - both are external USB drives. I was hoping to tell Time Machine to resume backing up the laptop's internal drive to the Time Machine drive, but I don't see any obvious way to do that.
Is there some way I'm missing? Maybe using
tmutil from the command line?