I am running out of memory on my C drive and when I went and checked I found that I had 105 Gb in a folder Master Cataloge. I am not sure if this is a duplicate or what but this seems to be a lot of data for a operating file. We store all of our photos on an external drive so we are confused what this means. How can I determine what I have an what I can get rid of to free up space. I have included a screen shot of these other files to help you. The ones without sizes noted total 90 Gb and do exlude the Backups.
Catalogs are .LRCAT files. Folders could be the preview cache that Lightroom Classic creates and uses. You can instruct LrC to change the ways that previews are created and saved in Catalog Settings; and you can delete the file and LrC will rebuild as needed — note you are trading off disk space for LrC speed in the Library Module, less disk space used by LrC Library module will be slower.
You have three catalog files in that folder (v10 and v10-v11 are older copies), but they do not take that much space. The biggest space is no doubt taken by the previews (their size isn't shown in the screenshot), which is quite normal. Like @dj_paige said you can delete them, but Lightroom will rebuild the previews because it can't function without them. So in time that folder will grow again.
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