"The system.sav folder is specific to Compaq/HP systems. As there are differences in the restore procedure in different models of Compaq/HP systems, it's best advisable to refer the user manual to know if those folders can be deleted. In mosts cases, you should not, unless you're 100% sure that you possess the OEM Restore CD (different from a OEM Recovery CD).
Having said that, please contact the OEM support for more accurate information in this regard."