u/grepnoid

I have a Debian server which embarrassingly is still on version 10.13. Normally to upgrade several releases you'd upgrade 10 to 11, 11 to 12, 12 to 13. Version 11 support ends at the end of this month, does this mean I have to upgrade to it in the next few days?

I'm also concerned about things breaking. Mainly web and mail servers. They have a lot of config and a new version installed with the upgrade could be incompatible.

What is the safest way to do it, and hopefully with the least downtime. To swap to a new server would be expensive and difficult.