what happens if you upgrade icloud to 50GB from 5GB, store up all the photos, notes, pages on it, but then downgrade to 5GB? all the 50GB files will be in my iphone and macbooks , correct? rather than transferring the files into an external HD then transferring to the macbooks or to iphone, right?
If I may, I'd like to advise caution if you intend to go ahead with your plan.
Firstly, you would have to purchase the 50GB of storage at £$0.99 per month. The process of syncing all the photos et al takes time. This is not done in 5 minutes. It could take many hours depending on whether you are using the computer during that time as the syncing is a background function. This is especially so with regard to photographs and videos.
Once complete, I doubt Apple would sanction a "downgrade" to 5GB and even if they did, there would be a serious risk of losing data and you'd have to be very careful how you handled the data on all your devices. I see a prize mess here.
EDIT: I've just seen that Rod, being a much faster typist and top guy, has given you a splendid summary of the facts, consequences and further options.
I did think of withdrawing my poorer post, but in combination with his, I think you get the message. And I totally agree with him that in time you will need more syncing/storage and let's be honest £$2-99/month is less than a cup of coffee and you get 200GB - which I reckon you will eventually require.
Sorry, Rod. I think your post was more lucid than mine.
Ian