Wikipedia
SyncBack
SyncBack is software which allows backing up and synchronizing files to the same or different drives, to different media ( CD, DVD, Flash, zip), or to a remote server.
There are three versions of SyncBack available: SyncBackFree, SyncBackSE ( shareware) or SyncBackPro ( shareware).
The program has been highly rated for being easy to use.
SyncBackFree is free for home and business use. SyncBackSE and SyncBackPro include a number of extra features, e.g. open file copying, versioning, SFTP, backup to CD/DVD, 256-bit AES encryption, backup to email servers, scripting, cloud, MTP, backup of email, etc.
The software also offers a "verify" command which allows MD5 hash comparisons between files to ensure accurate data copying.