There are two problems with storing all your photos on your phone: They take up a lot of space, and if you ever lose your phone, your photos are gone, too. That's why you should back up your photos to the cloud. Cloud storage gives you a lot of space and convenience for free (or cheap).
The linked article looked at 11 of the top online photo services. While none of them offers the perfect mix of storage space, convenience, and price, they narrowed the field to our top four, which excel in different ways -- find out which one matches your needs.
Also, if you wonder how many photos you can you store in the cloud, find out in our guide comparing the major online photo services.