PBS Incremental Backup Question

So in reading the forums, I understand that each backup is a full backup due to how deduplication works. But I'm unclear as to if there's any impact to network traffic.

Said differently, does each backup (nightly in my case) transfer all the same data to the remote server each night and it then deduplicates or is there some intelligence to simply transfer the chunks that have changed and nothing more?

I ask because it seems like subsequent backups occur quicker than the first but maybe...

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