IT Baseline Protection Manual - The Information Warfare Site

Safeguard Catalogue - Communications Remarks
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- Data volumes
The total volume of data requiring backup must be compared with the
available storage capacity of the backup media. Here it is necessary to
determine whether the backup storage capacity (for example, one DAT
tape per backup session) is sufficiently large for the volume of data held in
the database.
If the backup storage capacity is insufficient, a concept for partial backup
of the database must be prepared. This might involve, for example, backing
up the data of individual applications or individual sectors of the database
in rotation, or only backing up modified data. The possibilities of partial
backup depend on the database software in use.
- Maximum permissible data loss
Here, it is necessary to specify whether a loss of data accumulated in the
course of one day is permissible in the event of damage to a database, or
whether the database should be restorable right up to the last transaction.
The latter option is generally chosen in cases where high demands are
placed on the availability and integrity of the data.
- Restart time
The maximum permissible time taken to restore a database after a crash
must also be specified in order to meet the applicable availability
requirements.
- Possibilities of backing up provided by the database software
Standard database software does not generally support all conceivable
possibilities of data backup, such as partial database backup. In individual
cases, a check is therefore required as to whether the prepared database
backup policy can be implemented with the available mechanisms.
This information can be used as a basis for defining a database backup policy
which must include a specification of the following items (also refer to
Chapter 3.4 Data backup policy)
- Persons responsible for the orderly carrying out of data backups
- The intervals at which database backups are to be performed
- The database backup techniques
- The times at which database backups are to be performed
- The data volume which is to be backed up in each session
- Documentation on performed data backups
- Storage locations for the database backup media
Example:
Backup from Monday to Saturday:
- Starting time: 3.00 am.
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IT-Baseline Protection Manual: Oktober 2000