I’m not sure about the UK site; I’m here in the States. But I do have Prime and use the unlimited photo storage to backup my photos (about 100 GB) from my Synology NAS. What’s nice about that is I use the Synology Cloud Sync software to automatically do the backup. So anytime I drop a photo onto the NAS it gets backed up to Amazon. The photos are also accessible via the Amazon Photo app on my mobile device. Hope that helps.