Will Duplicity download anything from the destination when doing a `remove-all-but-n-full`?

I'm using Google Cloud Storage to store backups taken by Duplicity. Since I just want to keep 4 full backups at the destination I run: duplicity remove-all-but-n-full 4 --force \ --s3-endpoint-url=https://storage.googleapis.com boto3+s3://example Since I want to avoid read charges I wonder if the above command will read anything from the server, or is it just judging which files to delete by using the files in the archive dir?