I start up GOG Galaxy click on the NMS icon and the program checks the online game with my laptop version. It will offer to update if the game has an update available and then tries to make sure the game progress files online and my computer are cloud synched. Unfortunately for the past week I keep getting a message that I have too much data and it won't sync until I have reduced the game content. It suggests deleting an old game. I've deleted 2 games and been through the remaining games and reduced the number of ships, pets, bases etc. Somehow the amount of data I'm supposedly trying to sync has gone up!

Anyone else had this problem - what's the solution?

Edit: SInce I didn't get a user response to this I tried using the GOG chatbot support. I did my best to describe this problem using the massive limitations of that system. After a very frustrating and unhelpful conversation with irrelvant issue topics that I was supposed to respond to the chatbot finally decided it could not create a support ticket. USELESS!

11 Days later and I'm still trying to figure this out. I've discovered that every time I launch Gog Galaxy it downloads to my computer a bunch of data associated with the games I've deleted - cache files etc. I'm convinced these are the files that keep pushing me over the limit. These games are no longer shown on the game selection screen so I can't re-delete them. If I manually delete the files from my cache (ie irrelevant 1.2mb base image files for bases and games that no loger exist) Gog Galaxy just reloads them onto my computer the next time I start the software up.

Is there a solution?

My solution was to turn off GOG cloud backups altogether.

Background: Once upon a time there was some tribal knowledge that making backups of the NMS "cache" cirectory and then deleting the original was a good idea. Because old cache data was clogging things up? Whatever, seemed like an easy thing to maybe make the game speedier. Since I'm an idiot I simply renamed the old cache directory to cache.bak1 and .bak2 and so on every time there was a major game update. Seemed reasonable. Might have worked!

What I didn't realize was that the cloud backup grabs everything in the NMS/DefaultUser directory. So, all of those backup directories got copied to the cloud. Oops.

And I experienced the same persistence in restoring unwanted stuff. Deleting the backup cache files locally only forces the game to download them again from the cloud. Can't get rid of them!

I wish that there was an option in GOG Galaxy to "purge cloud backups" or something similar. Delete everything on GOG's end of things and let me repopulate with current files. I searched for something to do that once and didn't find an option. Maybe there is in the new beta?

tk;dr I feel your pain. Now I keep my own backups on a flash drive.

There was a time when if Galaxy detected a discrepancy between what was on my computer and it's cloud data it would ask which version it should give priority to - for some reason it no longer does that. I do make backups of my saves folder occasionally guess I'll try and remember to do that a little more often. Thanks - not a solution there though. We need Gog Galaxy to do a solve as you suggested.

Sync now working again! Refer to this: https://www.gog.com/forum/no_mans_sky/enduring_the_gog_endurance_update