If your index size if smaller (a few 100 MBs), you can consider the SOLR's operational script tools provided with distribution to sync indexes from Master to Slave servers. It will update(copies) the latest index snapshot from Master to Slave(s). SOLR wiki provides good info on how to set them as Cron, so, no manual intervention is required. BTW, SOLR1.4+ ,also has feature where only the changed segment gets synched(but then index need not be optimized)
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