Simplify the following text for a Grade 7 native English-speaking person.
Original: The cost of a data loss event is directly related to the value of the data and the length of time that it is needed , but unavailable .
Simplified: When data is updated , it may change , and this may not be data loss . Data loss also does not occur when the data is unavailable for some time only , for example because the server it is stored on can not be reached .