I posted about this a while back.
duh, I finally figured it out.

I used Toast 6, in the end; to back up my docs and elements of the Lib folder.

Prior to and during burning Toast came up with a list of items it couldn't find. If it can't find, it can't burn, -39 error = Crash.

So I noted what those items were and what folders they are in, in my user Lib. I tossed them from Toast list. voila!

FWIW, those items are mostly from the user/lib/Prefs folder and a couple from user/lib/App support.

In my case I wanted to preserve Safari history and no other Safari items, iKeys folders (which I'm demo'ing and have certain lists that one would want), and QuickSilver (all except lists) and Microsoft (for Office).

So I burned today without problems. Hopefully the files are good if I ever have to.
I do this back up once a month at least, more often depending on what work has come in.

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!#$@@$#!

proofraed by OwEn the c@t.