I have CentOS 7 installed on my Windows 8.1 VirtualBox, and file-system sized 30Gb. It worked fine until this morning, then the storage became full (due to Downloads and Projects). I tried a tool called CloneVDI to clone the content of my HDD .vdi file into a large file-system (60Gb). Now when I launch the Linux with any of the .vdi (the old or the new), it launches, gets run, I log in, but I see its state seems to have been restored to an earlier time ( many of my downloads and files have disappeared ). 
VirtualBox state suddenly SEEMs to have been restored to an earlier time
linux;centos;virtualbox;virtual machine