I might be able to help you with this one...from a post here:
http://moodle.org/mod/forum/discuss.php?d=61847
Inside the moodle backup folder there is a file called backup.php around line 112:
//Adjust some php variables to the execution of this script
@ini_set("max_execution_time","9000"); <--- I changed this from a lower number
raise_memory_limit("800M"); <--- I changed this from 128M for the courses with lots of multimedia files.
Same thing with restore.php at line 133:
//Adjust some php variables to the execution of this script
@ini_set("max_execution_time","9000");
raise_memory_limit("800M");
Backup and restore
restoring course(s) time out
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