many lrcat, lrdata, and lrlibrary files are taking up a lot of disc space on my mac. How do I best manage these files, and can some of them be combined?

thank you both for your responses!

If they date back that far, they are safe to delete. If you wish to test and verify how safe, move them to a different location on your computer, and start and stop your LRC application, do a backup, etc. If LCR doesn’t complain, go ahead and toss them. Your email prompted me to take a look and see how old mine were. The ones that are highlighted were tossed moments after the screenshot was taken. 

Notice that the folders are backup data, I only keep about three, that should be enough. Also note that one of the “Gary-Photos-v14 Helper.lrdata” is almot a year old. I do not know why there was a subtle name change (there is an extra space after the hypen after my name), but the old one is also tossed.

If LRC complains, just return that file, but if it’s years old, that means that it’s not being used.

.lrcat files are catalog files. If you have lots of them, then they are probably old catalogs that you could probably delete. .lrdata files are auxiliary files to the catalog. Files with the same name as old catalog files can be deleted too. The .lrlibrary file is not from Lightroom Classic but from Lightroom (desktop). You should have only one such file.