I'd like to record data about system activity under FreeBSD for future analysis. If I were running a SysV system, I'd just sar and its related utilities, but that doesn't exist in the BSDs. (And bsdsar has gone missing.) I don't really care about specific formats or utilities, but I want to keep information about CPU, RAM, and VM utilization, as well as I/O information. At the same time, full acct process accounting both seems like overkill and doesn't really provide data I want: notably, data about preexisting processes.
I could just log the output from long-running vmstat, iostat, etc. commands, but it seems like there ought to be something tidier.
Ultimately, the question is:
What is a good way to find out recent past system utilization under FreeBSD?