Tarsnap - Online backups for the truly paranoid

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Tarsnap automatically "deduplicates" — that is, identifies and removes duplicate blocks of data — from the archives it stores.

While any one archive will usually not contain many copies of the same data (although there are exceptions, e.g., software developers with multiple check-outs of a source code tree), it is very common to have several archives created at different times which share a great deal of their content.