"The SSSD is intended to provide several key feature enhancements to Fedora. The first and most visible will be the addition of offline caching for network credentials. Authentication through the SSSD will potentially allow LDAP, NIS, and FreeIPA services to provide an offline mode, to ease the use of centrally managing laptop users."
"Laptop users will have offline access to their network logons, eliminating the need for local laptop accounts when traveling."
Ok, understood at least this feature.
When you said "you should have separate servers", did you mean separate physical PC's necessarily, or could it be one PC with an OS i neach partition?