Uploaded copy to google cloud breaks permissions

You can turn off those rules and obtain a full access login, as explained. If you prefer, use

That’s reUPloading done as Duplicati. Duplicati.CommandLine.BackendTool.exe does that:

Usage:
Duplicati.CommandLine.BackendTool.exe <command> <protocol>://<username>:<password>@<path> [filename]

The following commands are supported:
GET, PUT, LIST, DELETE, CREATEFOLDER

The program is in install folder, its command is put, URL is as in Export As Command-line.
Uploading one file is easy. If you want them all uploaded, you will probably want to script it.
I could advise more on Linux, but on Windows I don’t know PowerShell well. Anyone else?