by Ken Task.
Is legacy file system turned on in the Moodle to which you are restoring?
If not, turn it on.
Increase setting for PHP: time for script to run, memory each script can consume. Also increase max_packet_allowed and open_files_limit in MySQL. Change to PHP settings ... restart apache. Change to MySQL settings, restart mysqld.
KKeep fingers crossed .. do magic incantation ... and TIA (try it again!).
'spirit of sharing', Ken