I've mentioned this on threads like this before but i use a combination of cloud drives just with what you get for free to backup and make various things available across all devices.
They all have apps for iPhone\iPad, a web portal for any web connected PC or you can install the application on your PC to have a drive for them which then syncs with the cloud version. This means i'm pretty much covered across my iDevices, home laptop and work PC for things.
I've not paid for any additional storage and get 5.4Gb with Dropbox for my personal main use drive, 30Gb with OneDrive that i use with the camera backup in their app to back up photos with my iDevices, 50Gb with Box through some sign up link i found on HotDealsUK thats used to back up photos stored on the laptop from the digital camera and then 15Gb with Google Drive thats used to for the My Documents folder on the home laptop.
This means the 5Gb from iCloud is used for backing up the other halves iPhone. I dont really use Pages, Numbers, Keyword even though we have them on the laptop but the new updated versions of Word and Excel allow basic editing as well as connecting to both OneDrive and Dropbox.