What is RoboMirror?
RoboMirror is a GUI front-end for the quite popular Robocopy command-line
utility for Windows.
Robocopy is shipped with Windows Vista and available as free SDK tool for
previous Windows versions (RoboMirror already includes it).
Robocopy allows to robustly synchronize two directory trees, both locally
and across the network. It is therefore often used for mirroring purposes,
e.g. as a powerful yet free backup utility.
RoboMirror's aim is to make Robocopy more accessible by providing a very
simple and user-centered GUI, because simply most users do not know how to
operate the shell.
RoboMirror also supports volume shadow copies (from Vista upwards only).
By using shadow copies, all files can be copied, including ones locked by
running processes (Outlook, SQL Server...).
What are its features?
1) Very simple interface.
Simplicity was one of the primary goals as I started coding this little
application when my mum asked me for a nice backup tool. As I was not
able to find something I was looking for, I started this project with
the aim to be as simple as possible while still providing for what
most users need, e.g. performing backups of folders to external hard
drives or network shares, synchronizing an MP3 player with the music
2) Management of mirror tasks, defined by a source and a target folder.
When performing a backup, the target folder will be synchronized to the
state of the source folder, e.g. be a mirror of the source folder.
When performing a restore, the operation is reversed, i.e. the source
folder will be a mirror of the target folder.
3) Support for automatic task scheduling.
Mirror tasks may be scheduled on a regular basis (daily, weekly and
monthly at a given time).
The Robocopy output will be stored as an entry in the application
4) "Preview run" to identify the pending changes which are then presented
to the user, asking for confirmation. This should prevent unpleasant
5) Support for exclusions.
Entire subfolders, files and wildcards may be excluded from
synchronization. These items are treated as if they would not exist, so
they are not copied and matching existing items in the destination
folder are deleted.
Additionally, files may be excluded by any of the common attributes
(Hidden, System and Encrypted).
6) Support for extended attributes.
The user can choose to copy only data, attributes and time stamps of the
files or to also copy extended attributes, either only the access
control lists or everything (ACLs, owner and auditing information).
7) Support for volume shadow copies (from Vista upwards only).
By creating a temporary shadow copy of the source folder and operating
on that shadow copy, all files can be copied, including ones locked by
running processes (e.g. Outlook locking its .pst files, SQL server its
This is accomplished using another free utility, published by Microsoft
in its Windows SDK. RoboMirror is bundled with both x86 and AMD64
versions. RoboMirror uses a persistent shadow copy to be able to get
ahold of Robocopy's error code, and those persistent shadow copies
are only supported since Windows Vista.
Each text entry in the event log cannot exceed a total of about 31850
characters. This may cause incomplete log entries if many files are
RoboMirror needs administrator rights, possibly causing a UAC pop-up
on Vista every time it is started. This is due to advanced Robocopy
options and shadow copy creation.
What are the default Robocopy options used?
/mir /b /xj /r:1 /w:5 /tbd /np
Nothing special here; mirroring in backup mode, excluding NTFS junctions
(soft links; excluded because they may cause recursions) and 1 retry
attempt after 5 seconds if a file could not be copied (possibly due to a
network error or a locking process). You may modify the options to your
liking by editing the file "RoboMirror.exe.config" in the application
directory (e.g. "C:\Program Files\RoboMirror"). It is an XML file, open it
with your favourite text editor.
In that file you may also disable the "preview run" if you feel confident
and want to spare some seconds and a mouse click when performing a backup.
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