On Wed, Jul 17, 2024 at 14:36:21 +0800, Jeff Pang wrote: > I plan to use it for MX backup. > So the application ram is quite low (postfix consume few resources) In that case, I'd go for the most recent version of Debian you can run on whatever kernel you're using. Hopefully the current stable release (Debian 12), but you'll need to look into all the details of your VPS.