Using Robocopy to Mirror Directories

by Barry Dysert
(last updated October 9, 2017)

1

Robocopy is the tool to use when working with entire directories, since that's what it was designed to do. Let's say you want to "mirror" directories, i.e., make two directory trees contain identical files/folders. This is similar to using the /E switch (which is covered under the tip titled "Using Robocopy to Copy Entire Directories") along with the /PURGE switch. (The /PURGE switch tells Robocopy to delete destination files/folders that no longer exist in source.) The shorthand switch to mirror directories is /MIR, so the command to mirror directories is:

C:\> ROBOCOPY C:\Temp1 C:\Temp3 /MIR

This results in the creation of C:\Temp3, and all of the files and folders under C:\Temp1 will be copied to the newly built tree under C:\Temp3. In addition, if C:\Temp3 already existed, any files in its tree that are not in the C:\Temp1 tree will be deleted from the C:\Temp3 tree.

 This tip (13197) applies to Windows 7, 8, and 10.

Author Bio

Barry Dysert

Barry has been a computer professional for over 30 years, working in different positions such as technical team leader, project manager, and software developer.  He is currently a senior software engineer with an emphasis on developing custom applications under Microsoft Windows. ...

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What is 6 + 0?

2017-10-10 11:55:22

Len Richard

I didn't understand exactly what mir did. I copied around 300 cds to an external drive, then delete them from the folder they were in, so I could store more there for backup. When I again backed up this folder to my external drive it wiped out everything i had previously backed up. I did a googlie on this and discovered I was not the only person who got screwed. There needs to be a clear Warning Visible that nobody can miss explaining this. I tried 10 free recover tools, none worked. I finally found a trial version of a recover software, it worked and it cost be 70 bucks to purchase it. It was either that or lose everything. Nice to notice you have this explained. Too bad every other person offering advice doesn't.


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