yeah, good idea.
i’d always place these bakes on a new track OVER the existing work, so you don’t have to fish around in case of any revisions.
rendering as you go is a good thing, too,
like on lunch breaks, etc.
for a final render of a sequences that might still be complex, it can be a good idea to “freshen up” FCP.
close all other sequences and as many windows as possible.
quit & re-start FCP,
& quit as many other apps as possible ESPECIALLY Safari, which seems to be a huge Ram hog these days
then start your over-night render.
recently i use team viewer, a remote desktop type app to check on a long render happening on my work machine.
when it was done, i set off an export from the comfort of home.
nick