You may need to log in with an administrator account. When I run as administrator on Windows Server 2012, the VSS checkbox is grayed out. I don't think Arq or any other tool can do the same, because this is only made possible by Lock-Free Deduplication, an idea I came up with last year which inspired me to develop Duplicacy. The saving would have been greater had there been more computers. Snapshot duplicacy-win7 all revisions: 4,416M total chunk bytes, 4,044M unique chunk bytesĪs you can see, cross-computer deduplication almost halves the total storage space required to backup these repositories. Snapshot duplicacy-mac-mini all revisions: 1,834M total chunk bytes, 134,437K unique chunk bytes Snapshot duplicacy-xps8700 all revisions: 1,040M total chunk bytes, 54,795K unique chunk bytes Snapshot duplicacy-mac all revisions: 2,673M total chunk bytes, 993,411K unique chunk bytes The duplicacy check -stats command lists the total storage space each repository takes and how much of it is not shared with others: Snapshot duplicacy-win10 all revisions: 1,467M total chunk bytes, 482,815K unique chunk bytes Our Duplicacy code base (which also contains other projects such as Acrosync) resides on multiple computers (Windows and Mac), and I use Duplicacy for hourly backups. Here is a real-world example that shows the effectiveness of cross-computer deduplication. This reduces the storage space and speeds up the backup process (there is no need to upload a chunk that has already been uploaded by another computer). If you need to back up multiple computers, Duplicacy can use a single storage as the backup destination, so that identical files or blocks on different computers can be mapped to the same chunks. What distinguishes Duplicacy from other tools including Arq is the ability to do cross-computer deduplication. Yes, you need to run the program as administrator to enable the option. What do you see as the main benefit of duplicacy? It's has been a proven solution for years. ![]() Does the windows version offer support for Shadow Copies/VSS ?Īrq seems to be a main competitor.
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