Comprehensive Detailed Explanation with all CompTIA Server+ SK0-005 Study Guide References:An Open file backup solution allows files that are in use by other processes to be backed up without stopping those processes. This is especially important in environments where critical applications and services must remain operational while backup operations occur. Technologies like VSS (Volume Shadow Copy Service) in Windows provide this functionality, enabling the backup of open files such as databases or system files without disrupting the processes. * Differential and Archive backups are types of backup strategies but do not specifically address backing up open or in-use files. * Synthetic full backups refer to a method of creating a full backup by combining incremental backups and a full backup, but it does not specifically address open files.