SYNCBACK is GREAT. You can schedule each individual backup you set up, say like 15 minutes apart in the middle of the night, it will take care of it for you and leave you with a message as to overwrites, new, and any failures. It won't stop like for a .dat file, it will just tell you that that one failed.
Edit by seaeagle: Syncback is available from 2BrightSparks: Backup and Synchronization Software. License: $30 - A single user license for SyncBackSE covers its use on up to 5 computers for personal use. Volume licensing for businesses.