Are/What pak files (are) safe to delete?

I was recently running low on space so i thought i should delete giant files.I went to This PC then i clicked on the Local Disk and I searched size:gigantic.When i searched it all of the files we're pak files.I recently downloaded Fortnite for my little cousin, and before I downloaded Fortnite i had atleast 90 GB free.On the epic games launcher it said that Fortnite was 32.4 GB so i downloaded it.The next day i deleted Fortnite and went to install Zula.For Zula it said it required 5.4 GB of space, but when i tried to download Zula it said i was 4.3 GB short.I went to the File Manager went This PC and i saw that i only had 1.1 GB of space left.Since PAK files may include graphics, objects, textures, sounds, and other game data "packed" into a single file, I thought that they may be from my Fortnite download.So, I am asking if PAK files are safe to delete and if they are do I back them up to One Drive first or do I delete them right away?