What is a Clound?

It is "cloud" mistyped.

As to what "cloud" means, sky's the limit. It can mean almost anything. You can e.g. say "I have my head in the clouds" but it doesn't mean you would have somehow teleported your physical head to the Galaxy savegame cloud. I don't even think that is physically possible, the teleportation technology isn't quite there yet and you'd die anyway if your head would get detached from your body, unless you are some freaky alien creature with a detachable head.

Shhhh! You promised not to tell!

Ps. Don't mind us two clowns here. Unfortunately I don't use Galaxy at all so I simply don't know the answer to your question, so hopefully some Galaxy-expert soon replies. Or alternatively, you could contact the GOG support, I think they don't have much to do anyway so they'd be happy for anyone to contact them.

Hope you get it sorted out.

I'm not aware of any interface available for directly manipulating the storage available in the Galaxy cloud in terms of some kind of file manager or similar, nor of any other similar service such as that provided by Steam etc. I believe the only way to manipulate the cloud storage on any gaming service including Galaxy is through the individual games which are utilizing the storage themselves, either by disabling the cloud storage on a game by game basis to remove the space the given game is using from the cloud, or by going into individual games save game screens and selecting the "Delete save game" option provided by the game itself. Granted, this could be a time consuming endeavour depending on the UI presented for doing this in a given game, but I don't think there is any other option available at the present.

One way to speed it up which might work, is to install any game which you've previously had cloud saves enabled for, and let it sync a local copy of all of your save games, then back up all of them into a zip file with 7zip or similar, then disable cloud storage for that game, then delete a bunch of the save games using Windows Explorer (File Explorer in Windows 10) manually, then turn cloud saves back on for the game to re-upload a smaller set of save games back to the cloud. Repeat this with every game which is using cloud space to any appreciable amount. It can probably be done this way rather quickly I imagine even though it will take these additional steps to accomplish.

Perhaps it would be a useful new feature in the future to have a configurable per-game maximum storage to set up in Galaxy for each game or something, or a built in option to prune ancient save games or similar. Still, I haven't seen any other gaming service offer such options so perhaps it would be overkill and we just need to manage how we use the service individually better.

On the other hand, some games have multi-megabyte save games, and if you're a save scummer like me, it doesn't take very long to build up hundreds and hundreds of save games for one single game, which can be easy to go over 1GB in a few weeks time, say save scumming The Witcher 3 regularly for example. I have several gigabytes worth of save games for that game locally.

Maybe it's time for GOG to buy new hard disks for their cloud CDN during Black Friday sales and bump up the max storage to 2-5GB per user? Just an idea I'm throwing out there. :P

A funny (or scary) dog.

Now for some reason I've got the image of a dozen clowns stuffed in a wardrobe stuck in my head.
MAKE IT STOP!

Thanks for all the numerous replies, even with the Clound (now on purpose) issue.
Following i attack a picture, to clarify.

*shakes head*
The poor picture.