Você deve usar o comando nativo Robocopy do Windows, em vez de usar o comando XCOPY ou FC é muito mais robsust para completar sua tarefa do que como você descreve que está fazendo. Esse é um método simples e claro que usa os comandos nativos do Windows ROBOCOPY a partir de um script em lote ou linha de comando. Você também pode verificar o arquivo de log para os arquivos exatos que foram diferentes e foram copiados para o destino recursivamente depois.
Se você está criando algo novo, é melhor usar Robocopy em vez de XCOPY , pois XCOPY é um comando obsoleto destinado a ser substituído pelo Robocopy especificamente por Microsoft a partir do Windows Vista (e mais recente SOs) eu acredito.
Script de Robocopy
(Veja Script Note abaixo para opções que usei neste exemplo e também certifique-se de alterar os caminhos variáveis sourcedir e targetdir nos quais você precisa deles. Certifique-se de testar a partir de um teste local bem apenas para ser minuciosa e para se confirmar antes de usar para fins de produção)
@ECHO ON
SETLOCAL
SET SourceDir=C:\SourcePath
SET TargetDir=C:\TargetPath
SET LogFile=C:\LogPath\Logfile.txt
ROBOCOPY "%SourcePath%" "%TargetDir%" *.* /PURGE /S /NP /R:5 /LOG+:%Log% /TS /FP
GOTO EOF
Nota de script
Eu usei essas opções no meu exemplo, mas veja abaixo como ver todas as opções para melhor atender às suas necessidades particulares.
/S :: copy Subdirectories, but not empty ones.
/PURGE :: delete dest files/dirs that no longer exist in source.
/NP :: No Progress - don't display % copied.
/R:n :: number of Retries on failed copies: default 1 million.
/LOG+:file :: output status to LOG file (append to existing log).
/TS :: include source file Time Stamps in the output.
/FP :: include Full Pathname of files in the output.
MAIS PESQUISA E DETALHES
Na linha de comando do Windows, digite Robocopy /? e pressione Enter
C:\Users\User>robocopy /?
-------------------------------------------------------------------------------
ROBOCOPY :: Robust File Copy for Windows
-------------------------------------------------------------------------------
Started : Fri Dec 18 02:29:48 2015
Usage :: ROBOCOPY source destination [file [file]...] [options]
source :: Source Directory (drive:\path or \server\share\path).
destination :: Destination Dir (drive:\path or \server\share\path).
file :: File(s) to copy (names/wildcards: default is "*.*").
::
:: Copy options :
::
/S :: copy Subdirectories, but not empty ones.
/E :: copy subdirectories, including Empty ones.
/LEV:n :: only copy the top n LEVels of the source directory tree.
/Z :: copy files in restartable mode.
/B :: copy files in Backup mode.
/ZB :: use restartable mode; if access denied use Backup mode.
/EFSRAW :: copy all encrypted files in EFS RAW mode.
/COPY:copyflag[s] :: what to COPY for files (default is /COPY:DAT).
(copyflags : D=Data, A=Attributes, T=Timestamps).
(S=Security=NTFS ACLs, O=Owner info, U=aUditing info).
/DCOPY:T :: COPY Directory Timestamps.
/SEC :: copy files with SECurity (equivalent to /COPY:DATS).
/COPYALL :: COPY ALL file info (equivalent to /COPY:DATSOU).
/NOCOPY :: COPY NO file info (useful with /PURGE).
/SECFIX :: FIX file SECurity on all files, even skipped files.
/TIMFIX :: FIX file TIMes on all files, even skipped files.
/PURGE :: delete dest files/dirs that no longer exist in source.
/MIR :: MIRror a directory tree (equivalent to /E plus /PURGE).
/MOV :: MOVe files (delete from source after copying).
/MOVE :: MOVE files AND dirs (delete from source after copying).
/A+:[RASHCNET] :: add the given Attributes to copied files.
/A-:[RASHCNET] :: remove the given Attributes from copied files.
/CREATE :: CREATE directory tree and zero-length files only.
/FAT :: create destination files using 8.3 FAT file names only.
/256 :: turn off very long path (> 256 characters) support.
/MON:n :: MONitor source; run again when more than n changes seen.
/MOT:m :: MOnitor source; run again in m minutes Time, if changed.
/RH:hhmm-hhmm :: Run Hours - times when new copies may be started.
/PF :: check run hours on a Per File (not per pass) basis.
/IPG:n :: Inter-Packet Gap (ms), to free bandwidth on slow lines.
/SL:: copy symbolic links versus the target.
::
:: File Selection Options :
::
/A :: copy only files with the Archive attribute set.
/M :: copy only files with the Archive attribute and reset it.
/IA:[RASHCNETO] :: Include only files with any of the given Attributes set.
/XA:[RASHCNETO] :: eXclude files with any of the given Attributes set.
/XF file [file]... :: eXclude Files matching given names/paths/wildcards.
/XD dirs [dirs]... :: eXclude Directories matching given names/paths.
/XC :: eXclude Changed files.
/XN :: eXclude Newer files.
/XO :: eXclude Older files.
/XX :: eXclude eXtra files and directories.
/XL :: eXclude Lonely files and directories.
/IS :: Include Same files.
/IT :: Include Tweaked files.
/MAX:n :: MAXimum file size - exclude files bigger than n bytes.
/MIN:n :: MINimum file size - exclude files smaller than n bytes.
/MAXAGE:n :: MAXimum file AGE - exclude files older than n days/date.
/MINAGE:n :: MINimum file AGE - exclude files newer than n days/date.
/MAXLAD:n :: MAXimum Last Access Date - exclude files unused since n.
/MINLAD:n :: MINimum Last Access Date - exclude files used since n.
(If n < 1900 then n = n days, else n = YYYYMMDD date).
/XJ :: eXclude Junction points. (normally included by default).
/FFT :: assume FAT File Times (2-second granularity).
/DST :: compensate for one-hour DST time differences.
/XJD :: eXclude Junction points for Directories.
/XJF :: eXclude Junction points for Files.
::
:: Retry Options :
::
/R:n :: number of Retries on failed copies: default 1 million.
/W:n :: Wait time between retries: default is 30 seconds.
/REG :: Save /R:n and /W:n in the Registry as default settings.
/TBD :: wait for sharenames To Be Defined (retry error 67).
::
:: Logging Options :
::
/L :: List only - don't copy, timestamp or delete any files.
/X :: report all eXtra files, not just those selected.
/V :: produce Verbose output, showing skipped files.
/TS :: include source file Time Stamps in the output.
/FP :: include Full Pathname of files in the output.
/BYTES :: Print sizes as bytes.
/NS :: No Size - don't log file sizes.
/NC :: No Class - don't log file classes.
/NFL :: No File List - don't log file names.
/NDL :: No Directory List - don't log directory names.
/NP :: No Progress - don't display % copied.
/ETA :: show Estimated Time of Arrival of copied files.
/LOG:file :: output status to LOG file (overwrite existing log).
/LOG+:file :: output status to LOG file (append to existing log).
/UNILOG:file :: output status to LOG file as UNICODE (overwrite existing
log).
/UNILOG+:file :: output status to LOG file as UNICODE (append to existing
log).
/TEE :: output to console window, as well as the log file.
/NJH :: No Job Header.
/NJS :: No Job Summary.
/UNICODE :: output status as UNICODE.
::
:: Job Options :
::
/JOB:jobname :: take parameters from the named JOB file.
/SAVE:jobname :: SAVE parameters to the named job file
/QUIT :: QUIT after processing command line (to view parameters).
/NOSD :: NO Source Directory is specified.
/NODD :: NO Destination Directory is specified.
/IF :: Include the following Files.