If you delete files or folders from your myCloud folder or directly from myCloud.ch, these will be moved to the corresponding recycle bin / trash. Files located in the trash will no longer be synchronised between your devices and will be retained until you permanently empty your trash. You can find more information about permanent deletion here.
Please note: if you delete files from your trash on your computer, these will not automatically be removed from the trash bin at myCloud.ch. Thus, you’ll still have a copy of your files even when you completely remove them from your devices.