This is a Plugin, not an App - it does NOT run standalone
Get the main app here: http://play.google.com/store/apps/details?id=com.dynamicg.timerecording
This plugin provides Dropbox integration to Time Recording (data backup, recovery and reports upload). Note it requires full access to your Dropbox, not just "per app file access". If this bothers you use the Google Drive Plugin instead (which is limited to accessing its own files).
See this page for backup and restore usage: