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14:4 (Disk-based backup systems (Virtual tape libraries (VTLs) (consist of…

- - - - FOR DISASTER RECOVERY PURPOSE replicated from primary site to a backup site using the hardware based replication provided by a disk array
  - - - Can occur
        
        with some delay (asynchronous mode, when data are transferred to the backup site with some delay).
        
        real-time (synchronous mode, the data are not written to the primary site until the backup site sends the confirmation the replicated data have arrived and safely written to the disk)
  - - - especially efficient and effective while used in combination with backup and recovery
- - - - shipping them to the backup and recovery server
        
        convert data for subsequent storage on tape or disk
  - - - the special part of the backup and recovery software (agent) designed especially for the particular make and version of the database.
    - - provisions for maintaining program patches on a current basis at all backup locations.
    - - for long-term retention, it is necessary to have technical support and maintenance agreements to guarantee that the alternate backup hardware will work properly in case of restoration.
- - - - synchronous (i.e., the local disk write is not
        confirmed until the data are written to the disk on the other site)
      - asynchronous (data are replicated on a schedule basis)
      - adaptive (switching from one mode to another depending upon the network load).
- - - - Unauthorized access, loss or tampering with this information (either onsite or while in transit) could impact the information system’s ability to provide support for critical business processes,
    - - • Secure physical access to library contents, ensuring that only authorized personnel have access.
      - • Encrypt backup media especially when they are in transit. :truck:
      - • Ensure that physical construction can withstand fire/heat/water. :fire: :sweat: :droplet:
      - • Locate the library away from the data center, preferably in a facility that will not be subject to the same disaster event, to avoid the risk of a disaster affecting both facilities.
      - • Ensure that an inventory of all storage media and files stored in the library is maintained for the specified retention time
      - .• Ensure that a record of all storage media and files moved into and out of the library is maintained for the specified retention/expiration time.
      - • Ensure that a catalog of information regarding the versions and location of data files is maintained for the specified retention time and protecting this catalog against unauthorized disclosure.
  - - - care should be exercised to ensure that the means of transporting data, :tram:
    - - Standardization
        
        Very specific technologies require a lot of support for
        both the primary site and the offsite facility, increasing costs.
      - Capacity
        
        in order to reduce the number of media necessary to implement a backup set.
      - Speed
        
        Processes to backup and restore should be completed in an
        acceptable time, to comply with business requirements
      - Price
        
        attention must be paid to
        media prices.