Read the below thread as 1.464 version is a bit old ( >4 years old ):
https://groups.google.com/forum/m/#!searchin/jenkinsci-users/Upgrade/jenkinsci-users/55-9UlaD44A
You can look for some other threads about how to.backup your jenkins setup before doing any actions in this mailing list or read the below wiki:
https://wiki.jenkins-ci.org/display/JENKINS/Administering+Jenkins
Cheers