Backblaze Personal Backup: Reliability Metrics and Developer Constraints

The Pitch

Backblaze provides a $99/year flat-fee backup service for personal machines, promising unlimited storage regardless of file size (Backblaze Pricing 2026). It remains a staple discussion point for users seeking low-maintenance disaster recovery without the overhead of manual S3-tier lifecycle management.

Under the Hood

The hardware backend remains objectively stable. The 2025 Annualized Failure Rate (AFR) for their data centers dropped to 1.36%, demonstrating high hardware reliability despite ongoing software-side complaints (Official 2025 Drive Stats).

However, the client-side logic presents significant hurdles for engineering workflows. By default, the software excludes critical developer directories including .git, .svn, and .gradle folders to optimize scanning cycles. Overriding these exclusions requires manual XML editing, a process that is poorly documented and prone to regression (GitHub Gist #bb4bd43a44efd73b87d857e29b1d5b96).

The risk of silent data loss is a primary concern for the technical community. Because .git folders are excluded by default on several OS configurations, a developer could lose their entire version history while under the impression that their project is fully protected (UsedBy Dossier).

Data retention for external drives is strictly tethered to a 30-day "phone home" requirement. Failure to connect a drive within this window results in data purging unless a specific extended history plan is purchased (Reddit r/backblaze Jan 2026).

Restoration reliability has also been flagged as a failure point. Users have reported that support was unable to recover files despite continuous payments for the 'unlimited history' feature, suggesting inconsistencies in how deleted files are indexed (HN Thread).

System performance remains a bottleneck during high-traffic periods. The backup client has been observed throttling speeds to 1/100th of available bandwidth, which significantly impacts users trying to sync large datasets (Reddit Feb 2026).

We don't know yet the status of a native Linux client for Personal Backup, which remains absent from the 2026 roadmap. Furthermore, a detailed technical breakdown of 'bzmergeblock' attributes in configuration files has not been made public (UsedBy Dossier).

Marcus's Take

Backblaze is a backup solution for your parents, not your repositories. The default exclusion of .git folders is a silent killer for any serious developer, and the reports of restoration failures on HN suggest the "unlimited history" is more marketing than engineering reality. If you use it, treat it as a secondary failsafe and never your primary source of truth. Skip it for professional workloads and stick to a managed B2 or S3 implementation where you actually control the encryption and retention policies.

Ship clean code,
Marcus.