Don't worry about the FTP REST command -- it's actually not that useful for this particular application.

If you want to hack around installing/configuring it (and redoing again after any player s/w change), then rsync is the way to go for backing up anything in the filesystem.

But for me, it's just not worth the hassle. I'll just use mirrordir over FTP from a Linux box -- nothing special (other than Hijack) required on the player end. And also use FTP to grab the dynamic data partition as one largish file. That's it. Complete.

Cheers