I've had good luck using
FolderSync on my rooted NSTs. The current version, 2.5.6 dated Dec. 16, 2013, runs fine. The app is frequently updated yet still runs on Android 2.1. I've found it provides the same sync capabilities as Dropsync, plus the ability to use a number of other private and cloud services. I use it to sync Calibre newsfeeds from my SFTP server. You can have it sync folders on demand or on a background schedule. It is also scriptable with Tasker for more granular control.