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4.4Backup and recovery (methods, RTO/RPO)
Covers the differences and recovery procedures among full backup, incremental backup, and differential backup; generation management that retains multiple generations; off-site storage as protection against disaster; and how backup methods correspond to the recovery objectives (RTO, RPO), building judgment for selecting a method from business requirements.
A backup is not an insurance policy of "keep one and relax"; it is the task of designing a method to meet the business requirements of "to which point in time you can roll back (RPO) and how fast you can recover (RTO)." Full, incremental, and differential each trade off the time and storage capacity at backup time against the complexity and time of the recovery procedure, and the choice shifts depending on whether you prioritize "the burden on the taking side" or "the speed on the restoring side." This section builds the judgment to accurately understand each method's recovery procedure and select a method by working backward from the recovery objectives RTO/RPO.
4.4.1Full, incremental, and differential backup
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