Explanation
A differential backup is a backup method that protects all the changes that have occurred since the last full backup. A differential backup copies all the files that have been added or modified since the last full backup, regardless of whether they have been backed up before or not. A differential backup does not reset the archive bit of the files, which means they will be backed up again in the next differential backup. A differentialbackup requires more storage space and time than an incremental backup, but it simplifies the restoration process, as only the last full backup and the last differential backup are needed to restore the data