This article describes in detail the Child, Parent, Grandparent backup cycle.
When performed according to the following instructions, the Child/Parent/Grandparent backup method offers iron-clad security against loss of data.
|Backup Name||Frequency||Storage Location||Description|
|Child||Daily||Current set on-site, others off||Four sets of media, each with four sub-sets sufficient to backup data (typically using a differential or incremental backup) Monday through Thursday. Rotate the four sets so a different one is used each week and rotate the sub-sets so a different one is used each day.|
|Parent||Weekly||Off-site||Five sets of media, each with sufficient capacity for a full back-up. Rotate the sets, using one each Friday of the month to make a full back-up.|
|Grandparent||Monthly||Off-site||Twelve sets of media, each with sufficient capacity for a full back-up. Rotate the sets, using one for a full back-up on the last Friday of each month of the year.|