Consolidation: For on-prem locations, Rubrik reads the expired snapshots from the chain, consolidates their unexpired blocks, and writes the single consolidated snapshot back to the on-prem NFS or object-store.For cloud locations, Rubrik also considers if the storage savings at least offset the cost of the required cloud compute resources. The system checks for heuristics such as snapshot chain length, the proportion of the chain that has expired, and the time since the last consolidation. Heuristic check: Rubrik routinely checks archive locations to determine if consolidation is required.Users must also configure Cloud Compute settings by specifying the VPC, Subnet, and Security Groups where Rubrik Bolt instances can be launched to perform consolidation. Configuration: Users must explicitly enable Archive Consolidation on Cloud archive locations.This method requires chains to grow increasingly long, which in turn enforces higher RTOs and storage costs. As a result, the chain cannot expire until every snapshot in the chain has expired. When recovering from an incremental snapshot, the recovery aggregates the data of that incremental with all previous incrementals in the chain, plus the first full snapshot, which anchors the chain. With the legacy approach, an incremental snapshot could be past its expiration date but forbidden from expiring if there are newer incrementals in the chain that require it for recovery. With legacy data protection systems, keeping snapshot chains short requires periodic full backups, which are inefficient and costly and can impact SLA compliance. As incremental snapshot chains grow, they become slower to recover and costlier to store. Since incremental snapshots are incremental relative to previous backups, they form “snapshot chains” that increase in length until the next full backup is taken. However, incremental backups can be tricky to manage, particularly as admins look to safely expire snapshots past their retention date. Most IT admins prefer incremental backups to full ones, as they reduce backup windows, storage costs, and unnecessary redundancy.
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