Auto Verify Mode; Write Mode - HP BB118BV - StorageWorks Data Protector Express Package User's Manual & Technical Reference

Incremental This setting instructs Data Protector Express to back up all selected files that have changed
since the last backup. For each file, Data Protector Express resets the incremental bit in the catalog
and the archive bit on disk.
Copy This setting instructs Data Protector Express to back up all selected files, but it has no effect on any
future scheduled job. (A copy backup job does not reset the archive bit after backing up all the selected
files.) Use this option when you wish to make a record of files or systems at a particular time, but do
not wish to disrupt the normal backup schedule.

Auto Verify mode

The Auto verify mode is either No verify, Full verify or Quick verify.
After Data Protector Express backs up a file onto a piece of media, it can verify that the file was backed
up correctly. Data Protector Express reads the file from the media and compares it to the original file
(Full verify mode). If any discrepancies between the two files are found, the file is considered to have
failed the backup.
It is strongly recommended that the Auto verify mode be set to Full verify. Verifying that data has been
correctly written to the media is an essential part of a comprehensive backup program. Also, verifying the
files ensures that the media and the media drive are working correctly. Restoring data after a disaster is
no time to discover that the data was incorrectly stored to begin with.
No verify This setting instructs Data Protector Express to skip the verification step. It is not recommended.
Full verify This setting instructs Data Protector Express to compare every selected file stored on the
media with the original file from the PC desktop or file or application server. This default option is
strongly recommended.
Quick verify This setting instructs Data Protector Express to be certain that every file backed up onto the
media is in readable condition. It does not verify that the data is correct, only that the data stored on
the media (incorrect or not) can be read. While selecting this option can save time, it is nonetheless
not recommended.

Write mode

The Write mode is either Append to all media, Append to first media, overwrite others or Overwrite all
media. For automatic rotation jobs, Data Protector Express overwrites all media. For other jobs, Data
Protector Express uses the write mode settings set by the user.
For more information, see
This mode determines whether the old data on the media is overwritten with new data or whether the
new data is appended to the end of the old data. When media is overwritten, all of the data previously
stored on it is lost. Appending data will preserve the old data.
Unless the media is meant to be stored permanently, select Overwrite all media. This is because when
media are rotated (reused), Data Protector Express overwrites it. If you have appended data to the media,
overwriting will result in the loss of not just the oldest material, but all of the data on the media, including
the most recent. For this reason, use Overwrite all media for media you wish to reuse through rotation,
such as media that are part of a set of daily incremental backups, and Append to all media or Append to
first media, overwrite others for media meant for permanent storage.
Appending is useful if the number of media is limited or if the media are several times larger than the size
of the job. For example, a one gigabyte media could hold the contents of four jobs that are less than 250
Mbytes if these jobs were appended. However, if overwrite mode is selected, only one job will be stored
on media at once. Similar comments apply to other types of media.
Append to all media This setting instructs Data Protector Express to append all data to the end of the
media. No data is overwritten. Select this setting for permanent storage.
Append to first media, overwrite others This setting instructs Data Protector Express to append data to the
end of the first media, but to overwrite all media that follows. For example, Data Protector Express will not
overwrite the first media inserted, but will overwrite the second, third and later media. This setting is useful
Backup options automatically updated.
User's Guide and Technical Reference
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