The thing we need is the ability to get our data back if something catastrophic happens. This means we need A) the data itself and B) the ability to restore it.
Ultimately, backups are worthless; restores are priceless. We perform backups because they are a means to an end, not the end itself.
The sheer frequency of unexpected and catastrophic data loss events serves as cautionary tales that drive our investment in backups, not the desire for backups itself.
When questioning the necessity of backups, IT professionals can often point to recent events that remind everyone how costly data loss can be.
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