If you happen to use more than one tablespace, pg_basebackup will handle this just fine if the filesystem layout on the target box is identical to the filesystem layout on the master. However, if your target system does not use the same filesystem layout there is a bit more work to do. Using the traditional way of doing the base backup might be beneficial in this case.

If you are using --format=t (for TAR), you will be provided with one TAR file per tablespace.