How to create a pg_basebackup for without streaming?

I have a primary and a replica Postgres database that are never connected to each other. We have another layer of technology to store a base backup and the WAL files to and those will get synced to the other server eventually. On the primary db, I set up the WAL files this way:

wal_level = logical
fsync = on
synchronous_commit = local
wal_sync_method = fsync
archive_mode = on
archive_command = 'test ! -f /var/lib/postgresql/data/wal/%f && cp %p /var/lib/postgresql/data/wal/%f'
archive_timeout = 3600

This works and every hour a new WAL file gets created. Now I'm trying to create a base backup because I believe WAL files don't work by themselves. They need an initial base backup. I tried running this command:

docker exec primary-db pg_basebackup -h localhost -p 5432 -U postgres -D /var/lib/postgresql/data/basebackup -Ft -z -Xs -P

But I'm getting the following error: > pg_basebackup: WAL streaming can only be used in plain mode I believe I'm not doing WAL streaming because the two databases are never connected to each other.