fwiw ~ I reached out to Norton Chat support:
Initially, Chat agent advised that Security History with Windows and Mac is retained.
After I sent pic of Norton 360 for Windows > Clear History.
Chat agent wanted a moment to discuss my case with “senior” or “supervisor”.
fwiw ~ as per my understanding from my Chat conversation:
Norton 360 for Mac - Security History is retained for some time (months) and then old History is over-written.
And “time” depends upon the volume of data, if you have more data…it will over-write at 3 months, or if you have less data it will over-write at 9 months…retention time depends upon the amount of data.