Centralized and Decentralized UPS Systems
BBUs provide localized, short-term backup power directly at the rack level, while UPS systems offer centralized power backup for the entire data center. BBUs typically last around four minutes, whereas UPS systems can sustain operations for 10-15 minutes until generators activate.

Such details provide a deeper understanding and appreciation for Centralized Power Backup Systems.
PDF CENTRALIZED UPS AND DISTRIBUTED UPS

UPS backup power strategies are conventionally deployed in two forms, centralized and distributed, and from a technical standpoint they serve the same purpose, namely, to keep power ceaselessly flowing, particularly during adverse conditions (i.e., surges, brownouts, fluctuations, total power outages, frequency differences and other power issues).

Such details provide a deeper understanding and appreciation for Centralized Power Backup Systems.
More Context About Centralized Power Backup Systems
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