are you referencing my post ? I said to run a $OTRS_HOME/bin/backup.pl, where, as told by Ralf, $OTRS_HOME should be /opt/otrs and then, after a new install on the new host with a version equal from the source system and copied files, run
$OTRS_HOME/bin/restore.pl.
then, in case you have installed a deb otrs package try to see home dir setted for the user otrs in passwd (then otrs files should be under that dir), in the other case you should have a otrs-xxx dir under the path where you have untarred otrs-xxx-tar.gz
You should probably have to create also a database on the mysql destination like "create dabatase otrs" because restore.pl import dumped db file but start it with "create or replace" tables (so it assumes that a otrs "schema" is presents).
hope I'm clear enough ;)
MV