Regarding backup, there are too many concepts in online, and I feel dizzy. What kind of backup set, format media header, backup media, etc. I don’t understand what these concepts mean.
backup database database name to disk='backup file path and name' This statement is executed twice in a row, then the backup file generated is twice as large as the file generated when it is executed once. In addition, in the restore use these two What is the difference between the two files produced by this operation?