Sounds like you need ArtSave. It will save your database files either automatically on schedule or on demand, and does incremental backups as well.
http://www.artsoftusa.com/eng/hpcprod.htm
Or you might try a less elegant solution such as APTimer which is a program that will wake up your HPC and run an executeable and turn itself off again. If there is a command line interface to a program, then you could use it to call a batch file to do your backup and close when it was over.