I'm curious about your strategy to backup indexes based on FSDirectory. If I do a file based copy I suspect I will get corrupted data because of concurrent write access.
My current favorite is to create an empty index and use IndexWriter.addIndexes() to copy the current index state. But I'm not sure about the performance of this solution.
I have no practical experience with backing up an online index, but I would try to find out the details of the write lock mechanism used by Lucene at the file level. You can then create a backup component that write-locks the index and does a regular file copy of the index dir. During backup time searches can continue while updates will be temporarily blocked.
But as I said, I'm only speculating...
Chris --
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