Time machine back up
I’ve got an old Mac, and I’m trying to back the whole thing up. Got a usb and started Saturday…..it’s still backing up. Is this because of the amount of data needing backing up (500GB) or am I doing something wrong?
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Likely it's just stuck. I suggest you stop the process, erase the drive and start over.
First backups do take longer, but from Saturday to Monday is not reasonable; couple of hours is more like it .