Clerks in Dickens novels followed a procedure that was ages old. They made a copy of everything they wrote and kept it as a record. The famous and the not so famous kept their correspondence. When I worked in a sales office every letter I wrote had two copies for the filing system, one for that customer’s file and another in a chronological file.
In the modern digital age of correspondence by email there is no such system. In the first place there is often no paper trail and secondly future historians will be deprived of a valuable resource. Many people now boast that they never keep emails. If it is casual conversation there is no great harm but if it is business correspondence it is a serious flaw in the system.