We had the problem that our server is splitted into 3 partitions. First one is Os, Second, the installed programs, Third. the data partitiion. This means that partition three is more often backuped than the other two. To reduce the amount to backup it would be good to separated jobs folder from the jenkins home folder.

When I am right the change would be in:
https://github.com/jenkinsci/jenkins/blob/5e9492d1229921d0c1701d880650671fddd6cbfd/core/src/main/java/jenkins/model/Jenkins.java