The spec file for the Traffic Ops RPM backs up config files and restores them during an upgrade. The the <2.0 versions of Traffic Ops stored the CRConfig config on disk, while it's in the database in >=2.0. This should be removed from the 2.x spec file.
Specifically, the app/public/*Snapshots path likely will not exist. There might be Trafficserver-Snapshots but definitely not CRConfig.