Rrsync is a perl script that is supplied as an extra with the rsync program. It must be used in conjunction with openssh-server or openssh-server-pam as it requires ~/.ssh/authorized_keys which is not supported by dropbear. Rrsync allows selective access to subdirectories in either read-only, write-only or read-write, depending on settings in authorized_keys. This allows for safe, restrictive access. It's particularly useful for automated backup purposes. An example usage would be this entry: command="/usr/bin/rrsync -ro /home" <public key here> This would allow a system connecting with this public key to be able to rsync FROM the /home directory tree only. It could not write to this directory, nor read from any other directory. Signed-off-by: Matt Reeve <matt@mreeve.com>