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Duplicati + Backblaze B2 vs Personal Backup: How to Find Your Cost Crossover

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A cost comparison between Duplicati backing up to Backblaze B2 and a Backblaze Personal Backup subscription shows that the better deal depends entirely on dataset size. Personal Backup charges a flat annual fee per computer for unlimited data, while B2 charges per gigabyte stored monthly plus fees for API calls and egress beyond free allowances. Dividing the annual subscription price by twelve times B2's per-gigabyte monthly rate gives the exact gigabyte threshold where costs cross over. Below that threshold, Duplicati with B2 is cheaper; above it, the flat-fee subscription becomes increasingly cost-effective as data grows. Additional factors such as number of devices, restore frequency, supported operating systems, and the time cost of managing Duplicati can shift the decision independent of raw storage size.

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