$null = New-Item -Type Directory -Force src Tests.ps1: Describe RoboCopySkippedFilesTests The behaviors save the code as Tests.ps1 and invoke it as Invoke-Pester. This causes the files that are considered the same to be copied unconditionally - and therefore potentially unnecessarily.Ĭaveat: Curiously, files that are the same with respect to last-modified file stamp and file size but differ with respect to the /it-related properties mentioned above are not included by default with /is alone therefore, to cover all eventualities, use /is and /it combined. Therefore, in the rare event that there could be files with identical last-modified time stamps and identical file sizes that nonetheless differ in content, your only option is to use the /is ( Include Same) option: Robocopy seems offers no option to detect sameness of files based on their content (which is typically implemented via a cryptographic hash function). auditing information (represented as U for the /copy parameter).file ownership (represented as O for the /copy parameter).ACL (represented as S for the /copy parameter).file attributes (represented as A for the /copy parameter).If you want to extend the default sameness detection (same last-modified timestamp and same file size) to the following properties, use the /it ( Include Tweaked) option: These arguments are only applied if RoboCopy has fundamentally deemed a given file / directory in need of copying, based on sameness / inclusion logic.This behavior is not affected by modifying what aspects of a file / directory to copy (parameters /copy / /dcopy) 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. Copies file if last write time, file name, or file sizes don't matchĪs indicated by the implied default /COPY:DAT will not copy over files with different data if the timestamp and the file size is the same and thus this is a default skip.Skips file copy if last write time, file name, and file size match.By default, Robocopy skips copying existing files if the specific metadata of the files match then those files will be skipped from the "file" copy operation ( /COPY:DAT).
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