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+pdumpfs: a daily backup system similar to Plan9's dumpfs
+What's pdumpfs?
+pdumpfs is a simple daily backup system similar to Plan9's dumpfs
+which preserves every daily snapshot. pdumpfs is written in Ruby.
+You can access the past snapshots at any time for retrieving a certain
+day's file. Let's backup your home directory with pdumpfs!
+pdumpfs constructs the snapshot YYYY/MM/DD in the destination
+directory. All source files are copied to the snapshot directory for
+the first time. On and after the second time, pdumpfs copies only
+updated or newly created files and stores unchanged files as hard
+links to the files of the previous day's snapshot for saving a disk
+WWW: http://namazu.org/~satoru/pdumpfs/
+Author: Satoru Takabayashi <satoru@namazu.org>