Disk space required

Deleting stuff off my Mac to create more disk space on my hard drive and I have old back ups of Lightroom
room is it ok to delete this or not, just not sure ?

In order to answer your question, one should understand how to "restore" a backed up Lightroom Catalogue...

Here's a link that explains that process...
https://www.youtube.com/watch?v=W9RGsNOI4qs

You can readily delete "older" backup files...

Also realize, the lightroom backup it only backs up the Lightroom catalogue... That's just a pointer to files on your system, and any non-destructive changes you've made and not your actual graphic files...