How to Delete Lightroom Backups

To delete lightroom backups, click the Lightroom button in the top left corner of the screen
click the lightroom button in the top left corner

Choose Catalog Settings
choose catalog settings

Click on the show location button
click the Show button to show the location where backups are stored

Open the file to see a folder inside with your backups
Find the folder with your backups

Now open that and get rid of everything but the last few
Delete all but the last few backups

Once that’s done, you’ve now deleted your lightroom backups
Your backups have now been deleted