This works, to back up C drive to \\DEST_SERVER\E$\SHARE, if disk2vhd.exe is within the path:
REM
REM A simple backup system using disk2vhd
REM
REM version 1.3, by J.E.B., 2011-02-22
REM
REM requires 'disk2vhd.exe' to be in the path
REM
setLocal EnableDelayedExpansion
REM "DRIVES" can be one drive identifier with colon, multiple separated by spaces,
REM or asterisk for all.
REM "DEST" can be a drive letter or a UNC.
SET DRIVES="*"
SET DEST="\\SERVER\SHARE"
REM Keep most recent 4 VHD files in DEST, delete the rest
for /f "skip=4 tokens=* delims= " %%a in ('dir/b/o-d %DEST%\*.VHD') do (
del %DEST%\%%a
)
REM Backup to VHD
C:
cd \
DISK2VHD %DRIVES% %DEST%\D2VBK--%date:~-10,2%%date:~-7,2%%date:~-4,4%_TS.VHD