Provided in PR 18577 by David.S at idiom dot com, some modifications
by me to use buildlink2 files, and to specify the correct version of
python required.
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 (if it is running as root), and modification times. Finally,
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.
