Correct way to free up Time Machine space
Here is a Q&amp;A covering manual ways of cleaning backups.


How can I manually delete old backups to free space for Time Machine?


You can always just wait for Time Machine to delete old backups as there really is no need to free up space on the backup volume. In cases where you may need to recover old backups and don't have a proper archiving solution, some people archive the entire drive once it fills and start with a clean one.

As a photographer almost always has a separate archiving solution, letting Time Machine manage the backup space is often a workable plan and maintains a good 6 months of deleted data in all the cases I've seen on 2 TB drives.