Backing up baby's photos and videos

My phone is running out of space as it is bursting with thousands of photos and videos of my 5-month old baby. I'm a hoarder so I can't bear to delete her videos and photos. Every single one is too precious. Would like to ask you mummies how do you store and back up your children's photos and videos? How often do you back up, or is it an automatic backing up? I'm not a cloud user, is that what you guys use? If cloud, do you pay for it?