Source: http://feeds.gawker.com/~r/lifehacker/full/~3/SmGFk29p-QY/toucan-syncs-and-backs-up-your-files
Windows only: Portable application Toucan backs up and syncs your data between two locations (like your hard drive and your USB drive). Weighing in at just over 4.10MB installed, Toucan offers several advanced backup and syncing settings, like incremental backup with compression (supporting 7-Zip format), portable drive variables, scripts and advanced rulesets. Similar to SyncBackSE but smaller and portable, Toucan is a nice option for making sure you've got everything on your thumb drive. Toucan is a free download for Windows only.