OAKLAND, Calif. — Alphabet Inc’s GOOGL.O Google will start limiting how many high-quality photos users can store on the company’s cloud back-up service starting next June, it announced on Wednesday, in a move that could help protect profit margins. “Growing demand for storage” means Google Photos can no longer honor a years-old policy of unlimited capacity for high-quality images, the company said in a blog post. Storage of images, along with files in Google’s document editing services, will instead be capped at a combined total of 15 gigabytes. “Original quality” images, or incredibly high-resolution copies, were the only ones to previously count against the limit. Google’s plans for additional storage, dubbed Google One, start a $2 a month.