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Rsync and ssh provide the first three features. By using a Unix feature called hardlinks, 10 daily snapshots of a 5 megabyte file that hasn't changed take only 5 megabytes of space on the backup server. If that file is used on 10 machines (because, perhaps, it comes with the distribution used on all 10), those 50 5 megabyte files take up only 5 megabytes on the server! As the documentation mentions, the freedups package from is required to get this benefit.