command, but with some critical differences, since the "crash"
command is designed for crash backups. "crash" will save in a
temp file and removes the file after a successful recovery.
"archive" can be used at any time to make a complete snapshot of
a layout in a single file, or to read back that snapshot.
There is a "writeall" option that will make a snapshot including
layout of all read-only (PDK) cells.
R. Timothy Edwards