Large .atlas file sizes

[micah68ph 3]

Can anyone tell me what the .atlas files are in the server Saved folder like C:\ATLAS\ShooterGame\Saved\01.  I am running a 3x3 grid and one of my servers is not spinning up.  I noticed in the Saved folder for it all the .atlas files are over 350MB, but that grid has never actually been visited by anyone.  But the grids that have people living on them and building the saved folder only has .atlas files of like 10-15MB.  Curious if maybe the file size is indicative of something corrupted in that Save and if I should start it over.

If I want to wipe a grid, can I just rename the Saved folder and let it recreate based on the ServerGrid.json file?  Is that the easiest way to wipe a grid or will I have issues with the redis database too and have to mess with stuff there?