So I have this MBP running HS with an internal 1TB SSD formatted as APFS but only about 170 GB used. I wanted to clone it to an old external drive with several partitions, one of them is 220 GB and blank. Rebooted into recovery mode and using DiskUtility from there I thought I could clone the 170 GB data to the 220 GB blank partition. But that won’t work because the data is on a 1TB partition.
I recalled that there was some issue with block copies only working when the target partition is larger than the source partition. I then also remembered that back in the HFS+ days you could resize a partition. DiskUtility would somehow do this in a non-destructuve way by moving all the data to one continuous section first and then reduce the partition housing that data. So I figured that all I needed to do to get this to work is resize the MBP’s partition to ~180GB (i.e. enough to hold the data) and then that partition could be cloned to the 220 GB partition left on the external drive. Finally, I’d resize the partition again back to its original 1 TB.
But now that this MBP’s SSD is running APFS there does not appear to be any way to live resize the partition. Did I just not find it in DiskUtility or does that actually really no longer work? Any other ideas how to convince DiskUtility to close these 170 GB of data from the APFS volume to the 220 GB external partition?
If indeed none of that works anymore, I’ll probably just buy a larger backup drive. I’m not buying any third-party cloning software.