Regarding the lost data that we seemingly had over the last weeks, finally we were able to resolve it:
In short, those "lost" frames ended up on the "old" Google Drive instead of the new storage 😅
I copied it now to the new system, and you should see it shortly there. I am relieved, considering it's about 55GB (!) of missing data.
As for the internet connection in namibia, it is currently basically unusable. Working on it, but it is more tedious than I hoped.