Scrivener has a sync option that saves the work into a number of separate files. Scrivener syncs the files with the scriv file each time it opens and closes. I use that feature with dropbox to write on my Android phone and an interesting device called an "openpandora". Sync is only available in the Mac version. It's supposed to be in the next windows version but it's been on the wanted list for quite some time.
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