I would need more to answer your question
Answer:
its copyright has expired
Explanation:
If a work is in the public domain it means that it's copyrighte has been expired.
After the period of copyright protection has expired, a work becomes available for use without permission from the copyright owner; it is now said to be "in the public domain." Most works enter the public domain because their copyrights have expired.
Answer: All of the above
Explanation:
200 OK, 301 permanently moved and 400 bad request all are the Hyper text transfer protocol (HTTP) response status type. The HTTP response status types basically indicated the complete request in the HTTP.
All these given types are the responses and request that are involved in the HTTP status type.
200 OK is one of the request which basically depends upon the HTTP status type success.
301 permanently moved is the response in the URL which are used for permanently change the resources of request.
And 400 bad request is not properly understand by server due to the invalid syntax in the HTTP.
Answer:
Nelson proposed a system where copying and linking any text excerpt, image or form was possible.
Explanation:
Ted Nelson is one of the theoretical pioneers of the world wide web who is best known for inventing the concept of hypertext and hypermedia in the 1960s. As one of the early theorists on how a networked world would work.
How I know:
I goggle it.
It really depends on your type of data, if it's sensitive data or not. And it also depends on what type of backup (Incremental, Decremental, etc.). But you should aim to backup at least once a week, and also do a backup of your original backup.
