MCSA/MCSE Self-Paced Training Kit (Exam 70-270): Installing ...

20-8 Chapter 20 Backing Up and Restoring Data
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Figure 20-3 Choose one of the available backup types.
Some backup types use backup markers, also known as archive attributes, which
mark a file as having changed. When a file changes, an attribute is set on the file that
indicates that the file has changed since the last backup. When you back up the file,
this clears or resets the attribute. Types of backups include the following:
Normal During a normal backup, all the selected files and folders are backed up.
A normal backup does not rely on markers to determine which files to back up.
During a normal backup, any existing markers are cleared and each file is marked
as having been backed up. Normal backups speed up the restore process because
the backup files are the most current, and you do not need to restore multiple
backup jobs.
Copy During a copy backup, all the selected files and folders are backed up. A copy
backup neither looks for nor clears markers. If you do not want to clear markers
and affect other backup types, use a copy backup. For example, use a copy
backup between a normal and an incremental backup to create an archival snapshot
of network data.
Incremental During an incremental backup, only the selected files and folders
that have a marker are backed up, and then the backup clears markers. Because
an incremental backup clears markers, if you did two consecutive incremental
backups on a file and nothing changed in the file, the file would not be backed up
the second time.
Differential During a differential backup, only the selected files and folders that
have a marker are backed up, but the backup does not clear markers. Because a
differential backup does not clear markers, if you did two consecutive differential
backups on a file and nothing changed in the file, the entire file would be backed
up each time.