Glock 30SF Dry Fire Question

I hear all over the place that it's OK to dry fire Glock's regularly... But I recently heard that there were cases where the breach face got cracked open from excessive dry-fire so now glock issued a warning to customers? Does anyone know whether or not I should use snap caps? I'd hate to leave a snap cap in the chamber when I put the gun away, because I thought you were supposed to pull the trigger for storage to keep tension off the springs? I'd hate to have one in there if I had to load the gun if someone broke into my house with precious seconds ticking away... Anyone?

Thanks