IT Baseline Protection Manual - The Information Warfare Site

Safeguard Catalogue - Communications Remarks
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Availability
requirements
Effort for
reconstruction
without backup
Type of
data
backup
Frequency Number of
and time of generations
data backup
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IT-Baseline Protection Manual: Oktober 2000
X
Data volumes X
Modification
volumes
X
Modification times (X)
Procedure
and storage
medium
Responsibility
for
data backup
Storage
site
Requirements
for
backup
archive
Transport
modes
(X) X X X X X X
(X)
X
X X X X X
X X X
Deadlines X
Confidentiality
requirements
Integrity
requirements
Knowledge of IT
users
X
X (X)
(X)
(X)
Storage
modes
X X
X X X X
(X) X X X X
X X
X implies direct influence, (X) implies indirect influence
Remarks:
Type of data backup
The following types of data backup are evident:
- Data mirroring: With this procedure, copies of data are stored
redundantly on several different media. These data media are usually fast,
so that duplication of the data media and the required control software
result in high costs. The major advantage of data mirroring is that a failure
of one of these data media can be counteracted quickly.
- Full data backup: With this procedure, all data requiring backup are
stored on an additional data medium without consideration as to whether
the files have been changed since the last backup. For this reason, full data
backup requires a high storage capacity. Its advantage is the simple and
quick restoration of data due to the fact that only the relevant files need to
be extracted from the last full data backup. If full data backups are carried
out infrequently, extensive changes to a file can result in major updating
requirements.
- Incremental data backup: In contrast to full data backup, this procedure
simply stores the files which have been changed since the last (incremental
or full) backup. This saves storage capacity and shortens the time required
for the data backup. The restoration time for data is generally high, as the
relevant files must be extracted from backups made at different stages.