Removing duplicate apps after migrating from Time Machine backup
I based my question on the assumption that the 'Purgeable Data' information reported in the Disk Utility app included duplicate app data. That was an invalid assumption.  Upon further investigation, the Mac Storage view showed the space as free.  The 'Purgeable Data' was actually Time Machine snapshots. I was able to trim the size of the snapshots as per the folowing article by reading all the way through and selecting the last (not checked) answer.  Be advised there is a typo in his terminal command. Should be tmutil thinlocalsnapshots / $((100 * 1024 * 1024 * 1024)) 4 I don't have the points to edit his answer but someone really should. How to Clear Purgeable Data