How to Maintain A Computer System Start a notebook that includes information on your system. This notebook should be a single source of information about your entire system, both hardware and software. Each time you make a change to your system, adding or removing hardware or software, record the change. Always include the serial numbers of all equipment, vendor support numbers, and print outs for key system files. Secondly periodically review disk directories and delete unneeded files. Files have a way of building up and can quickly use up your disk space. If you think you may need a file in the future, back it up to a disk. At a minimum, you should have a sys