Unfortunately no one can be told what fun_plug is - you have to see it for yourself.
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I think maybe more people than myself has been looking for something like this. I have set it up on my DNS-323 (Using Debian distro as base).
This perl script takes backup from multiple servers through SCP/SSH into your backup server. On the servers you want to backup, you only need to create a backup user. You do not need to install any certificates and the normal key exchange process. The script uses Expect to pass on the password and automatically log into the server you want to backup. Very simple.
http://www.deltascripts.com/deltabackup/
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This might come to late if you've already purchased it, but using debian, you could have tried rsnapshot, it's in apt. Don't know about passwords, though.
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