PHPBB2x Backup/Restore:

UPDATE phpbb2_config SET config_value = 'domain_name_here' WHERE config_name = 'cookie_domain';

UPDATE phpbb2_config SET config_value = 'domain_name_here' WHERE config_name = 'server_name';

UPDATE phpbb2_config SET config_value = 'path_to_phpBB' WHERE config_name = 'cookie_path';

UPDATE phpbb2_config SET config_value = 'domain_name_here' WHERE config_name = 'script_path';

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