Now that we have seen how to back up our system, we need to put in place an automated procedure to remove the drudgery of manually invoking
dump at regular intervals.
The manual pages for dump do provide some guidance on how often to back up and at which level to reduce restoration time.
In the event of a catastrophic disk event, the time required to restore all the necessary backup tapes or files to disk can be kept to a minimum by staggering the incremental dumps. An efficient method of staggering incremental dumps to minimize the number of tapes follows:
Always start with a level 0 backup. This should be done at set intervals, say once a month or once every two months, and on a set of fresh tapes that is saved forever