Necesité ejecutar un respaldo en una Tarea programada de Windows, usando XCOPY. He aquí el script.
@echo off
REM http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/xcopy.mspx?mfr=true
REM /y Do not ask about overwritting
REM /q quit
REM /s copy subdirectories
REM /i create source directory
REM /e copy empty directories
REM /k retain read only attribute
REM /r copy read only files
REM /h copy hidden and system files
REM /exclude:filename1[+[filename2]][+[filename3]] : Specifies a list of files containing strings.
set SOURCEDIR=%1
set DATETIME=%DATE:~6,4%%DATE:~3,2%%DATE:~0,2%%TIME:~0,2%%TIME:~3,2%%TIME:~6,2%
xcopy %SOURCEDIR% %SOURCEDIR%-%DATETIME% /i /s /e /k /r /h >> %SOURCEDIR%-%DATETIME%.log 2>&1
if errorlevel 5 goto diskerror
if errorlevel 4 goto lowmemory
if errorlevel 2 goto abort
if errorlevel 0 goto exit
:lowmemory
echo Insufficient memory to copy files or invalid drive or command-line syntax. >> %SOURCEDIR%-%DATETIME%.log
goto exit
:abort
echo You pressed CTRL+C to end the copy operation. >> %SOURCEDIR%-%DATETIME%.log
goto exit
:diskerror
echo Disk error. >> %SOURCEDIR%-%DATETIME%.log
goto exit
:exit