Website Archiving
This type of service archives a website so that changes to the website over time can be seen. Unless archived, older versions of a website cannot be viewed and may be lost permanently. Fortunately there is at least one web service (see Internet Archive) that tracks changes to most websites for free. Past information about a company can therefore be gleaned from this type of service, which can be very useful in some circumstances.
Read more about this topic: Website Tracking