The "Other" category on your iPhone and iPad is basically where all of your caches, settings preferences, saved messages, voice memos, and… well, other data is stored. With a bit of patience, you can reduce the amount of space it takes up on your iPhone or iPad. We are here to help.
Apple's iCloud Photo Library is a great online backup service, but even online sync services need to be backed up, just in case. Here's everything you need to know about how to back up your iCloud Photo Library.