In an incremental backup, only the changes since last incremental backup or last differential or full backup are saved. For the restore, the whole chain of incremental backups must be available. Stratesave supports Differential backups for files and databases, and purely incremental backups for SQL and Exchange server databases. Purely incremental backups of databases allows for very frequent backups (e.g. once every 10 minutes), because the backups are small since they contain only changes made since last incremental backup. This allows to restore the database almost up to date in case of crash, which can be important in some environments.
See also : Differential backup