Photos app allows you to backup photos and videos to share with others and access them on any device. If you are using iPhone and it running out of space, then you can check the Photos app and delete some photos to free up the space. If you don't want to delete some of those priceless photos, then check out the points below.
Import Photos from iPhone to Computer:
If you have installed Photo Stream on your Mac or PC, then your photos should automatically go into your computer. You should be able to delete them from your Camera Roll and off your iPhone. But if you are not enabled Photo Stream on your Mac or PC, then you need to connect your iPhone to computer with the data cable that came along with your iPhone. Your computer sees your iPhone as a another camera. You can import your iPhone photos to Mac
or PC. If you are using Mac, then you can use iPhoto to import photos from iPhone to Mac. Once you have imported photos to Mac, select "Delete Items After Import" option to delete photos after import.
Clearing Off Photos Without a Computer:
If you don't have a computer and want to backup your photos, then you can use clous storage services. There are several cloud storage services are available online. You can use OneDrive, Dropbox, Google Drive or Box to backup your photos safely. All cloud storage services provides automatic backup service from your iPhone to your account. Once you have backed up photos to cloud storage service, you can access your photos from any where on any device. You can also share your photos with family and friend with a single click.