> I tried creating a file with dump on the NetBSD 1.4.2 (i386) and copying
> it to the Solaris 7 (SPARC) system. The ufsrestore command does not under-
> stand the file format. The dump file is 12 GB and some of the data files
> are 2 to 4 GB each (the rest are smaller source code files).

dump/restore is not a portable format.  It sometimes works between
different operating systems, but this is not reliable.

> Should I be using something else, like tar or zip?

tar is a portable format, so it's usually a good choice.  cpio and pax
(which writes tar or cpio formats) are other possibilities.

Regards,

Giles