should I update my Mac Pro from Big Sur to Monterey?
should I update my Mac Pro from Big Sur to Monterey or just keep the Big Sur operating system?
Yes.
As Update macOS on Mac - Apple Support explains, "it's a good idea to back up your Mac."
A Time Machine backup conveys the ability to "undo" the upgrade if you so choose. Besides, if you don't back up your Mac, then you don't care about the prospect of permanently losing all the information on it. The fact you asked this question suggests you care.