Choose Backblaze B2 when the bucket will hold terabytes and a per-TB rate is easier than a small subscription. Choose DigitalOcean Spaces when 250 GiB and 1 TiB of transfer for $5 a month, plus the built-in CDN, covers the workload.
Backblaze B2
Pay-as-you-go object storage billed per terabyte
$6.95/TB/month
Strengths
Egress is free up to 3 times the data you store
There is no minimum file size or storage duration
Limits
Egress past that 3x allowance is billed
A high-throughput tier, B2 Overdrive, starts at $15/TB/month