Confused about iCloud backup
Hello,
My friend has an iPhone but no computer. We are considering getting her on iCloud for two reasons:
1) To back up her phone
and
2) To be able to archive off some data so that she can regain some space (currently her phone is completely full).
Although I have been reading up on iCloud the one thing I cannot seem to understand is whether the second point is possible or not. More specifically, is iCloud backup more like sync or an actual backup. Can she "move" pictures and videos off of her phone and onto iCloud easily (to make more room locally) and if so, are these archived files reasonably accessible (either by re-downloading them to her phone) or via a web-page interface from another machine?
Thanks for any help. I am reasonably technically savvy, but have almost no experience with the iOS ecosystem.