Yesterday The despoolr receive was about 55GB. I removed about 22GB yesterday (files older than 3 weeks), the large files were the exact same size ~9GB. There are 4 .TRY files of the exact same size, dating back about 2 weeks. Reading more closely at the despool log file revealed that it was having issues decompressing our Win8 OS image. I believe these files are the image files it failed to decompress.
My sites are fairly well connected, I don't recall exactly, but I think it will take about 3-4 days to replicate 50+GB content library.
Reading more into this issue now, I am getting Error 1295 - Despooler failed to merge delta to the compressed package "US00015E". The operating system reported error 1295: The requested file operation failed because the storage quota was exceeded. To free up disk space, move files to a different location or delete unnecessary files. For more information, contact your system administrator.
This is unusual as I have 25GB of free space on that drive currently.
C:\ was a bad place to install to. This was one of the early site installs, all newer sites install on a separate drive.