@linear Debian 11 will still have 10 months of regular security support, then LTS and ELTS, but I’m not yet sure what will be afterwards (Debian 12 is poetteringified too much already, and they’re actively investing into breaking nōn-#Poettering use cases for what will become #Debian 13, so I’d probably be a bit wary of installing it fresh for something you’ll want to run for more than six years or so, unless you plan on doing security support afterwards yourself.
tbh I’m probably looking at #NetBSD as long-term replacement even for $dayjob or maybe #OpenBSD.