[mootzville]

We've been using fpsync (http://www.fpart.org/fpsync/) to backup our production NAS. It is basically a scheduler wrapped around rsync. We use some 10g NICs for internal backups...it's fast enough that the SSD's are the bottleneck, so we are probably going to switch over to m.2's at somepoint.

Having said that, external transfers across the net will end up being your bottleneck, so you'll have to decide how much compression is worthwhile to reduce the time on the wire.

Another option, if available, is dump it all to drives, and snail mail it, but I'm guessing you already thought of that.

Good luck.