We have a number of iDevices in our household. All devices are linked to the same iCloud account for sharing apps, music and photo’s. The free 5 Gb storage is slowly running out. I could pay for more space but found that changing my backup settings bought me some time before this is really necessary.
Remember the rule of three for backups? iCloud provides the off-site backup. Make sure to backup what you care about. (and not everything when space is limited)
Switch off all apps that you don’t want to backup to iCloud. I switched off Evernote (already on their servers), Video Star (exported to camera role) and some more data hogging apps. This saved me the money for extra storage.