So I use Parallels to run 10,12, 10.13, & 10.14 VMs. I keep them 100% plain vanilla install, only installing the regular OS updates. I use these VMs for testing & always make a snapshot before testing & restore back once done to keep the VM clean. I've noticed that these VM's all seem to be ballooning in size. For example, my Mojave VM size is 29.13GB, About This Mac reports 15GB used, Macintosh HD Get Info & Disk Utility show 24.97GB used with 9.98GB purgeable. If I've never installed any applications, created any files, etc, what is purgeable? I am not signed into iCloud, this is a basic install with no 3rd party apps or files added. I don't expect the space used reported by the guest OS & the actual PVM file size to match but the discrepancy of nearly 10GB within the guest OS is what is confusing me. The other VMs for Sierra and High Sierra feature similar discrepancies regarding the purgeable space. How do I find out what this is and clear it out?