Download data after exceeding your icloud available storage

Hi,

I read some articles, but only option i can see is to delete data from iCloud .

For example i have 50 GB storage, but at a time I don't need for this option any more and my storage is reduce to 5 GB(FREE).

For example I still have 30GB synced at iCloud. What is the options after that ? Can I download this data (picures documentc ... etc) from iCloud or only option is to delete it ?