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@crazylife:

I only need to copy the new files from directory A that have not yet been copied to directory B.

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But the files of directory B will be removed after some time.
I only need to copy the new files from directory A that have not yet been copied to directory B.

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@echo off &setlocal DisableDelayedExpansion

REM create the archive folder if it doesn't exist
if not exist "A\archive\" md "A\archive"

REM pick up file by file
for %%i in ("A\*.pdf") do (
  REM check if the file size is greater than 0 to mitigate the risk of copying files which are still about to get written
  if %%~zi geq 1 (
    REM copy the file to B, then move the file into archive if the copying was successful
    >nul copy "%%~i" "B\" &&>nul move "%%~i" "A\archive\"
  )
)

pause

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@echo off &setlocal DisableDelayedExpansion
set "logfile=copied.txt"
set "jobfile=rcpy.rcj"

setlocal EnableDelayedExpansion

REM create a job file for robocopy (run ROBOCOPY /? and see what these options are for)
>"!jobfile!" (
  echo /xx
  echo /xj
  echo /min:1
  echo /r:1
  echo /w:1
  echo /ns
  echo /nc
  echo /ndl
  echo /np
  echo /njh
  echo /njs
  echo /log+:!logfile!
  echo /xf
)

REM append names of all files that have been already copied to the /xf option in the job file
>nul copy /b "!jobfile!" + "!logfile!"

REM execute robocopy
robocopy "A" "B" *.pdf /job:"!jobfile!"

REM remove the job file
del "!jobfile!"

REM sort the log file and remove blank lines which have been written for every new job (Win 10 only)
sort /uniq "!logfile!" /o "!logfile!"

pause