There are many different reasons for copying all or part of a web site. First of all, if it is your site, you need a backup! More than once I have talked with people who lost their entire site when their hosting service had a hardware problem or even went out of business.
In fact, the hardware problem hit me a couple of years ago; this newsletter's web site at www.eogn.com was lost when my hosting provider's disk drive crashed. When I called the hosting company's tech support department on the phone and asked them to go to their backups, there was a long silence on the other end of the phone line. The tech rep I was talking to finally admitted that they never made any backups of their customers' web sites. They expected their customers to do that!
I had most of the information backed up on my own hard drive although that backup was several weeks old. Luckily, I was able to recover about 99% of it after a sleepless night. I switched hosting providers a few days later.
I well remember one lady's story as she lost all of her web site when the hosting service went bankrupt and simply closed down. While she still had all her original data, it was not in web page (HTML) format. It required weeks to rebuild her web pages on a new hosting service.
You can also copy someone else's web site although you want to be careful about that for several reasons. Copyrights and other legalities pop to mind. Also, it is downright rude to copy someone else's information and re-use it. Yet there can be very good reasons for doing so.
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