Short answer probes talk to the host via SSL, as this is encrypted, its technically compressed in the process.
But considering sensor data is often very small bits of information, then compressing of small samples if not going to do much.
eg, create a txt file that says "0:OK" and zip it up - its compressed, but not any smaller.
Details here: some details here https://kb.paessler.com/en/topic/61108-what-security-features-does-prtg-include
Why do you ask? It sounds like a management or compliance question.
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