Backblaze

Pros

• Highly affordable pricing for large data volumes, often described as 'dirt cheap' per TB.
• Offers an 'Extended Version History' (formerly 'Forever' option) to prevent data loss from deleted files.
• Simple, automatic background operation suitable for non-technical users.
• B2 Cloud storage tier integrates well with Synology NAS for real-time backups.
• Reliable emergency recovery; users report it has 'saved' them after hardware failures.

Cons

• The standard personal backup plan does not support NAS devices.
• Data retrieval and remote downloads can be slow.
• Does not automatically back up shared directories (like Proton or Nextcloud) without manual configuration.
• Performance can lag when dealing with very large files, such as high-resolution RAW images.
• Pricing for NAS/Business backup is significantly higher than the personal tier.

Caveats

• By default, files may be removed from servers if the source drive remains disconnected for more than 30 days.
• Users must manually verify which folders are included in the backup to ensure no data is ignored.
• The service is primarily US-based, which may be a concern for users with specific data residency or privacy preferences.
• Using iCloud Photos may complicate the ability for Backblaze to access and back up local photo libraries.

Best for

• Photographers and videographers with large libraries of RAW files.
• Users looking for an inexpensive, unlimited off-site 'cold' backup.
• Individuals with multiple external hard drives that stay regularly connected to a computer.

Avoid if

• You need a cheap way to back up a NAS (requires the more expensive B2 tier).
• You frequently keep your primary data drives disconnected or in storage for more than 30 days.
• You require high-speed access to your backed-up files for frequent remote use.