I've taken over a site which will soon be replaced with probably a different CMS ...
But for now, what's the best advice to upgrade a small ten page site to latest version? Is it better to upgrade to 1.10 first (ie a stage at a time), or can I upgrade to 1.11.9 in one go? Also what is the security risk of just leaving as is (you can argue its been left a long time as is, without issue, could another couple of months hurt - I think this is a bit risky, but an upgrade of a site 4 years old will take a while?
I want to upgrade, but it sounds like a long process ..
I have taken backups of SQL and files first ...

Thanks