I’m not sure how it works with PIA, but on Proton I can export multiple configs, let’s say 6 different ones with a combination of countries and other options.
Then I add them all into KDE and I can switch between them at will.
It’s a slight extra cost of time at the start, but after that it’s smooth and easy.
Any cloud is a secure backup on Linux if you use rclone crypt :)
It works with Google Drive, Dropbox, One Drive, and countless others to create an encrypted cloud storage, where the cloud provider can never view your file contents.