OK let's step back a little.
First, depending on the processing speed, CPU usage can be quite normal, as we can be talking here about real-time processing (dedupe and compression) of 200MB/s data stream. That a lot of data to process every second!
Now, backing up to a Veeam repository should generally work much faster due to multi-streaming between data movers, you don't get this with SMB, which can mean a few times slower backup, and CPU usage reduced respectively. Of course, we would still want to confirm that with the logs just to be sure.
However, what is the real problem that you have with this CPU usage that prompted you to create this topic? Are you saying that this CPU usage is impacting your ability to use laptop? This should not be the case, as by default Veeam Endpoint Backup processes are set to run at a very low priority, and will use CPU only as long as no other application "wants" it. Can you make sure you still have the corresponding option enabled in Control Panel?