The EnforceReinstallationResources.zip has several uses, including but not limited to, using it as described in the article Restore the DLP Enforce Server across platforms in three-tier deployments (Article ID: 172274.)
The EnforceReinstallationResources can be used for example, when you upgrade as part of a roll-back plan, as part of disaster recovery plans, as well as general health and maintenance processes.
There is a need to have a backup of content from the reinstallation files for Enforce.
See the Symantec Data Loss Prevention Installation Guide appropriate to your version for specific instructions on how to create and use the reinstallation resources files, as well as for the appropriate path names.