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-rdiff-backup backs up one directory to another, possibly over a
-network. The target directory ends up a copy of the source directory,
-but extra reverse diffs are stored in a special subdirectory of that
-target directory, so you can still recover files lost some time
-ago. The idea is to combine the best features of a mirror and an
-incremental backup. rdiff-backup also preserves subdirectories, hard
-links, dev files, permissions, uid/gid ownership, modification times,
-extended attributes, acls, and resource forks. Also, rdiff-backup
-can operate in a bandwidth efficient manner over a pipe, like
-rsync. Thus you can use rdiff-backup and ssh to securely back a
-hard drive up to a remote location, and only the differences will
-be transmitted. Finally, rdiff-backup is easy to use and settings
-have sensical defaults.
+rdiff-backup is a simple backup tool which can be used locally and
+remotely, on Linux and Windows, and even cross-platform between both.
+Users have reported using it successfully on FreeBSD and MacOS X.
+
+Beside its ease of use, one of the main advantages of rdiff-backup is
+that it does use the same efficient protocol as rsync to transfer and
+store data. Because rdiff-backup only stores the differences from the
+previous backup to the next one (a so called reverse incremental
+backup), the latest backup is always a full backup, making it easiest
+and fastest to restore the most recent backups, combining the space
+advantages of incremental backups while keeping the speed advantages
+of full backups (at least for recent ones).
+
+If the optional (runtime) dependencies pylibacl and pyxattr are
+installed, rdiff-backup will support Access Control Lists and Extended
+Attributes provided the file system(s) also support these features.
+
+IMPORTANT: rdiff-backup 2.x is wire-incompatible with versions 1.x, for
+local backups there's no problem but if you backup remotely you have to
+use the same version of rdiff-backup in the client and server.