Currently the icloud is not synchronising any file. It is just stuck in the limbo. If I wont have had a recent backup all my files would have been lost. Since I updated to Big Sur, both my Mac have uploading issues with the icloud.
I used to synchronize both my MAC on one desktop and it was all stored in the Cloud. Since the new Big Sur Update both MAC do not synchronise or upload any data to the cloud. Indeed all the files have disappeared.
MacBook Air 13″, macOS 11.2