my Arch installation dates back to 2008 - haven't reinstalled since; just been using pacman -Syu with minor tweaks and fixes.
I think the time has come up to do something slightly more comprehensive than pacman -Syu ; not sure exactly what.
everything is still operational, so no complaints... but I'm getting the odd red flags at boot-up because of depreciated rc.conf and some daemons fail to start.
is there any user guide on e.g. reinstalling the base system within Arch? or reinstalling with minimal configuration afterwards?
I think much of my system is still running with old setups / configurations, rather than recommended configurations if that makes sense.
any suggestions would be much appreciated.
If you have been consistently -Syu'ing, then the only change you should need to make is to move to systemd. No need for a reinstall.
The wiki page has the details; the upshot is it is a quick and painless process, once you have read the relevant docmentation and made the necessary changes to your .conf files...