Biofeedback is a tool that helps individuals visualize how their biological systems work. For example, software can show individuals what their heart is doing and how basic changes in their breathing can influence their heart beat and overall health.
Soft copy means a data or information which can be stored in any kind of digital memory. It is an intangible form of preserving the material. You can see the record but cannot touch it. Monitors or others display screens are used to see the soft copy results.
External Hard drives are essentially bigger revisions of flash thumb drive with several times more capacity. There are also Sync programs that will apply any changes you have done to the desired folders in your computer to the files in your drive so that they are identical. The cost depends on the brand, type, and storage.