SNMP Logging Server/Software

I'm looking for a logging software/server which can be used at many remote locations.  Is there a solution which allows a central server to be located at a central site and then remote servers/software be installed at a bunch of remote sites.  The remote logging server/software will then report all the information for the systems it monitors to the main central SNMP software/server.  The reason for the remote servers/software which are located at the local remote sites is in case the sites lose network connectivity to the main central site the remote SNMP server will still be logging the information for all systems at the remote site where it is located, and when connectivity is re-established to the central site the log reports can be uploaded to the central site.