![]() ![]() ![]() It is simple: when the backup media runs out of space, the oldest backup is deleted, and the new one is written in its place. The simplest one is a ‘first in, first out’ (FIFO). There are some backup rotation schemes with different complexity and different efficiency. Simply said, our task is to get the most recovery points using the least storage space. GFS (Grandfather-Father-Son) backup retention policy pursues two goals: the minimization of storage space and the maximization of recovery points. That is why backup retention policy, or backup rotation scheme, exist. However, even with space-saving techniques like forever-incremental backups, synthetic backups, data compression, and deduplication, this approach requires unlimited storage capacities, and barely any company can afford this. The straightforward way to do that is to keep periodical backups, usually daily. Ideally, the goal of backup is the ability to recover data from any point back in time. ![]()
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