Restore backup trouble

I test actually to move to new hypervisor. I plan to install and restore WHM from a backup. I create a new VM with same spec cpu ram hdd etc... So after that when try to restore I have this : "... has 35.57 GB free and requires at least 83.98 GB free, which includes space for temporary files."
Really i dont get. I have for my vm 380Gb hdd. :rolleyes: