Location of Log files on TrueNAS Core

Can someone please tell me where to find the log files for the Urbackup server plugin on TrueNAS Core?

Thank You

Within the jail : /var/log/urbackup.log

Thank you so much.
Would you happen to know of a treatise on linux directories.
A thirty year windows guy would like to know things like why is var named var and usr named usr and what was the plan for storing what kinds of files in what directories.

Again, Thank You

A google search turns up:

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