I added the Archive Artifacts
post-build option to my project. I can see the artifacts from the web browser interface, but I cannot find them in the filesystem.
Where are they located?
It is being archived on the master server (even if the build were on a slave) in the following folder:
$JENKINS_HOME/jobs/<job>/builds/<build>/archive
But you can configure a different location using the 'Advanced' setting of the job (where you can set a different workspace folder) or using plugins that are made for this purpose such as Copy Artifact Plugin