Uh, and come to think of it, the /XO switch too (especially if you’re running a repeated backup of data to a USB HDD). Update: AND THE /B SWITCH (use backup rights). The switch worth mentioning the most though, is the /FFT switch.
Robocopy emcopy block changes full#
Robocopy on the other hand, does allow exclusion of more than one directory, each one specified using the /xd switch and can be a full path (to exclude very specific directories) or just one word (to exclude any directories with that name anywhere in the directory tree). This has mainly come about having discovered an annoying bug in emcopy whereby it doesn’t ignore the directories specified by more than one /xd exclusion – it always excludes the last one specified, but none of the others?! I thought it only fair to follow up with an equivalent post for good ol’ robocopy. To simply find zero-byte files and append their full pathnames to a logfile, useįor /r %F in (*) do if %~zF=0 echo “%F” > e:\logs\zerobytefiles.logĪs a compliment to my recent post “Data Migration using emcopy”
Note: to set your source and destination paths in a batch file, use the following syntax This will remove the zero-byte files, allowing you to subsequently re-copy the now missing files from the source If you wish to include the command in a batch file, you’ll need to double up on the % characters,įor /r %%F in (*) do if %%~zF=0 del “%%F” To recursively delete zero-byte files in your folder structure, use the following command The best solution I’ve found is to identify and delete any files that are zero-bytes in length before re-running another copy. Since the zero-byte files will have a newer time stamp than the source data, they become impossible to “fix” without potentially affecting surrounding files. The problems come when you re-run the copy in the hope that the zero-byte files in the destination folder structure are updated with healthy ones from the source. A common problem with data migration at the file level is that you can end up with users complaining of zero-length files.
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