When I add some docs by
post.jar(org.apache.solr.util.SimplePostTool), It commits after all
docs are added. It will call IndexWriter.commit(). And a new segment
will be added and sometimes it triggers segment merging. New index
files will be generated(frm, tii,tis, ....). Old segments will be
deleted after all references are closed(All the reader which open it).
That's ok. But I want to backup a version of my index so that when
something wrong happen I can use it. I can write a script to backup
all the files in the index directory everyday. But it may happen that
when it's indexing, the script may backup wrong files. So it must
obtain the ***.lock file to make things right. Is there any built in
tools in solr for my need ? I just want to back up the index
periodly(such as 0 clock every day).
