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By default, ZCB only allows the user to run 300 Incremental backups. However, users can adjust the Windows Registry to allow up to 500 Incremental backups. ZCB does not support an "Incrementals forever" approach to backups.

The resources consumed by ZCB during a backup increases for each Incremental backup in the backup chain. The more Incremental backups there are, the more memory ZCB requires and the longer it takes for each backup. In order to keep time and memory usage at reasonable levels, a periodic Full backup is required.

Editing the Registry to allow more incremental backups.

  1. Launch the Registry editor by typing regedit in the Run or Search fields of the Start Menu.
  2. Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Zmanda\ZWC\1.0\Engine\
  3. Look for the key MaxBackupLevel
    1. If MaxBackupLevel is not present, create it. It is a REG_DWORD key

  4.  Set the Value to the number of incremental backups you wish to allow.  
    1. This is a Decimal value. Not Hexadecimal.
    2. Remember, the maximum number is 500.
  5. Restart all ZCB services. This can be done via the Windows Services panel, or by clicking on Tools > Restart Background Service within ZCB.