Paul
Yes, I was trying to read vbackup's mind, from it's cryptic error
messages.
It turns out I was an idiot (and I had hoped that the email had
vanished into everyone's forgotten mail pile...).
vbackup isn't block based, but instead relies on interpreting the
underlying file system. I was trying to open an HFSX file system on
my Mac, and so it gacked. I've started an HFSX reader, but it's like
to stall for lack of time.
