145Disaster Recovery andBusiness Continuity of SCADA
reduced. However, to recover a system from an incremental backup, media
from different backup operations may be required. For example, consider
a case in which a directory needs to be recovered. If the last full backup
was performed three days prior and one le had changed each day, then the
media for the full backup and for each day’s incremental backups would be
needed to restore the entire directory.
3. Differential—A differential backup stores files that were created or
modified since the last full backup. Therefore, if a file is changed after
the previous full backup, a differential backup will save the file each
time until the next full backup is completed. A differential backup ...