Trash for deleted files in the GOG Cloud? It seems that I accidentally deleted a save on the disk that was important to me, but it was not synchronized from GoG. Why? How can I view cloud saves? Is there a trash there?

Cloud saves aren't typically available for individual games. Using that assumption, then it is Galaxy that is handling that.

File management typically is pretty easy, you have files, and files are either moved to a 'trash' folder as you have suggested, or just marked deleted and space isn't actually freed until it feels there's enough to make it worth it. FAT16 was well known for being able to undelete files so long as the blocks that had the files were untouched.

Then you go into a database. A database that would save contents as BLOBs. Binary Large Object . These much like before, would just be in a table, with an ID who it belongs to, what game it goes to, and any other data. Along with a 'deleted' or not, as removing such objects is more annoying.

So to the question is there an explorer/other for the cloud. To my knowledge no (but i don't use Galaxy so take with a lot of salt), but it's more an API issue than anything. It would be nice if such a feature was available, which would probably be directories of games, and then saves based on date and/or description (but such descriptions are unlikely)

If you deleted said save while offline, you could uninstall clear Galaxy local data, then reinstall Galaxy and re-sync your game saves from the cloud and get it redownloaded. If they got the message to delete a save, i don't know.

Click the Extras tab in GOG Galaxy (to the left of the Play/Install button) and scroll down to the bottom. Click the entry in the Cloud Saves Backup category to download it. If the download isn't successful, then there's no save data server-side.

There's no cloud save management of any kind. I don't know if support can help recover lost cloud saves; you can try opening a support ticket to find out.