I just - by coincidence - found out that I can only partial restore my WordPresss setup. When viewing my backups I see 14 available (as setup) and can download them all except one really crucial one: uploads.
The message is: Google Drive: succesfull obtained access token. No local copy available (the last sentence is actually in my local language)
Luckily this is however not the case, as I can see multiple upload zips in my Google Drive. These are around 80 MB large. For all other backup items I actually get file ready with tyhe option to download or delete.
What is going on? I really love UpdraftPlus, but that the plugin didn't warn me of this omission is something I take serious.