Configuring Backuppc for OpenWrt

It's good to backup your OpenWRTs, and it's really cool to do it with BackupPC!

First get your backuppc user's ssh key on the router:

Initial Setup

scp ~/.ssh/id_dsa.pub root@IP:/tmp

Now on the router:

cd /etc/dropbear
cat /tmp/id_*.pub >> authorized_keys
chmod 0600 authorized_keys

Now you should be able to ssh as that user without a password!

Backuppc Config

Because of the limited tools, you need to use TAR, and modify the config a bit to work with the busybox tar instead of the generic gnutar. Here is my config:

$Conf{XferMethod} = 'tar';
$Conf{BackupFilesExclude} = {
  '*' => []
};
$Conf{TarClientCmd} = '$sshPath -q -x -n -l root $host env LC_ALL=C $tarPath -c -v -f - -C $shareName+ exclude=/proc exclude=/sys exclude=/dev exclude=/rom';

That seems to be it really, it's just like backing up any other Linux server I guess...