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Create Synchronicity is a backup/synchronization tool that can help you protect your files, and keep your data up-to-date. You can use it for pretty much everything from copying your documents, pictures, music and videos to your USB Key or backup drive, to scheduling server backups with regex filtering and DST compensation.

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Create Synchronicity is packed up with useful features:

Fully customizable synchronization and backup, including:
Precise selection of folders to back up: you can select which folders to synchronize, and even synchronize folders contents without synchronizing subfolders.
Files inclusion and exclusion based on filename, extension, or regular expressions.
3 synchronization methods:
Mirror
One-way incremental
Two-ways incremental
(v3.5+) Full scheduling support (daily, weekly, monthly, at a particular time, etc.)
(v5.1+) Catching up: automatically reschedule missed backups
Clean, simple interface
Comprehensive previews
Comprehensive, pretty logs.
Comprehensive documentation, including expert features
Support for multiple profiles
Fully portable: settings are stored in individual configuration files
(v4.0+) By-volume-label paths: Create Synchronicity can backup directly to "My Usb"\Documents for example, by automatically locating the drive labeled "My Usb".
Advanced features ...