The big advantage of apps is they’re simple to use—even for technophobes—and they let you grant access to family and friends. Many are free or charge a minimal fee. On the downside, technical support can be hard to come by and users run the risk of glitches or even shutdowns. For that reason, it’s always a good idea to back up your photos in other secure places.Alternatively, you can set up a private website—it’s not as hard as it sounds—that is invisible to the general public and accessible by invitation only.