I have a name alongside with mail server.
I want to make a backup of whole system HDD as a single binary image file.
(let's say microsoft has *.vhd format, but it's not a good example of simplicity and functionality)
My server has 931 GiB of storage and only 60GiB is used.
So the total image file size should be 60 GiB not 931.
Server OS is running under FreeBDSM 8.3-RELEASE amd64
the filesystem is freebsd-ufs.
Please, make you suggestions.