The basic Robocopy command line will follow this general pattern: The basic command line syntax for Robocopy is similar to the syntax used for the familiar Xcopy command line application popular in DOS, so many years ago. SEE: 20 pro tips to make Windows 10 work the way you want (free PDF) (TechRepublic) How to construct the command line in Robocopy To help you get a leg up, I delved into Robocopy’s command-line switches and developed a nice little script you can use to create an exact mirror duplicate of all the data files in your user profile folder (C:UsersYourName). While you can easily do so by copying your files and folders to an external hard drive via drag and drop, that can be a tedious operation.įortunately, Robocopy provides more than 80 command-line parameters and switches ( Table A) that will allow you to create a powerful data backup operation. However, you may want to have an additional copy of your data files just to be on the safe side. If you’re conscientious about the safety of your data, chances are good that you are already using one or more of Windows 10’s backup tools. Top Tech Conferences & Events to Add to Your Calendar in 2023 How to Create a Local Account in Windows 11 Pro Support for these Microsoft enterprise products ends in 2023 ![]() For example, there’s File History, System Restore, Fresh Start, and System Image Recovery just to name a few. A good hashing algorithm will evenly distribute inputs to hashes, so every hash has an infinite number of possible inputs which could have produced it, which ties back into the first point.Windows 10 offers a plethora of ways to back up and restore your data–and even your entire system. Any algorithm that accepts an arbitrarily long input and produces a fixed length output must have a greater than 1-to-1 mapping. MD5 is broken and doesn't even provide that any more. This is a way for you to verify that you have the exact same file as OP, and nobody has modified it in any way.Ī (good) hashing algorithm doesn't guarantee anything, it just gives you a high probability that you have the same file. MD5 is a fast hashing algorithm so it is more vulnerable to certain types of attack than a slow one, but you can't take a hash and algorithmically determine what input produced it.īUT an MD5 hash of a file is just a unique signature for that file. MD5 is not a secure hashing algorithm and is easily reversed.Ī hash cannot be reversed. Increase the folder size to say 6TB and 15,000,000 files/folders, you'll definitely see the differences. ![]() So 6 minutes quicker with EMCopy, with the same attributes being copied, same number of threads, and permissions. Security Descriptor Setting(s) done: : 63477Īmount of copied byte(s) : 30 GB (32 730 088 649 Byte(s)) Log file : /log:t:\emcopy_test_same_thread.log Total Copied Skipped Mismatch FAILED Extras Let me state that should not be a bench mark, many factors can change the outcome of these tests, but I ran the tests on the same system, and with the same processes running both times. Here is a test I did, just for this post, EMCopy vs. Copies NTFS Permissions / Auditing Information / Owner Information: EMCopy and RoboCopy will both do this, but again, EMCopy just mops the floor with RoboCopy when running it side by side.Overall, EMCopy screams at doing a backup or mirroring a directory, because of the way it traverses the folders, which is in a non-linear manner. Performing Backups or Mirror Directories: EMCopy doesn't have a '/MIR' command, however you can use two commands that will only copy files that are newer on the source, and also to delete files that no longer exist on source. ![]() For smaller files it works better to have more threads, but it's important that the utility pre-allocates the files, to reduce fragmentation. copying a lot of larger files can benefit from fewer threads. There are down sides to multithreading though, e.g. Comparing EMCopy to RoboCopy with the same number of threads, EMCopy is 25-35% faster. ![]() RoboCopy does support 128 threads on new versions of Windows 2008R2 and above. Multithreading: EMCopy supports up to 256 threads.I'll just give you a few quick points of what works better with EMCopy. It is a free data migration tool, CLI only, and has a lot of features that just seem to work better than RoboCopy. What I have found on a long quest of trial and error is a utility called "EMCopy" from EMC. However, I've gotten to the point where RoboCopy is just not fast enough. First off, I love RoboCopy, I've used it for over a decade now, and I have no issues with it.
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