Why isn't ownership preserved with "rsync -a" on my Mac?
Solution 1:
If you open the Disk Utility
app and compare both drives, the internal drive will have Owners Enabled
set to Yes
meanwhile on the external drive it will be set to No
.
Solution:
Open the Finder
app, select the external drive, choose Get Info
from the File
menu, and uncheck the box ignore ownership on this volume.