![]() ![]() In other words: Robocopy considers two files to be the same based only on whether their last-modified time stamps and file sizes are identical and therefore skips copying in that event. Note: time stamp refers to the last-modified time stamp (only). The unofficial documentation, however, provides the crucial pointer (emphasis added):īy default Robocopy will only copy a file if the source and destination have different time stamps or different file sizes. Unfortunately, the official documentation doesn't describe the logic behind what files are skipped by default. S=Security=NTFS ACLs, O=Owner info, U=aUditing info). (copyflags : D=Data, A=Attributes, T=Timestamps Robocopy or Robocopy /? /COPY:copyflag : What to COPY (default is /COPY:DAT) Robocopy Default Options: /COPY:DAT /R:1000000 /W:30Īs confirmed by log file or command window running robocopy c:\source c:\dest * So if for some reason you have two files you are syncing that have matching file size, file name, and last modified attributes even though the data is different, it will not copy the source file.
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