You should try and increase the memory for php. This can be set in backup_zconfig.php.
PHP Code:
// ***********************************************************************
// Grab a large chunk of memory
// If your server allows this adjustment then adjust to meet your needs.
// ***********************************************************************
// ini_set("memory_limit","128M");
// ini_set("memory_limit","192M");
// ini_set("memory_limit","256M");
ini_set("memory_limit","512M"); // default
// ini_set("memory_limit","768M");
// ini_set("memory_limit","1000M");
Some times based on the server you can change the compress level to a higher number. (That only applies to zip files)
This can be set in backup_zconfig.php.
PHP Code:
$compress_level = 5; // 1-9 1 lowest 9 highest only works with zip file
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