Quick answer: The strongest Carbonite alternatives are Backblaze, IDrive and Acronis True Image. Backblaze is the closest match for most users; the others trade off on price, features or focus. All 6 are compared below on pricing, strengths and best use case.
Carbonite is a solid cloud backup tool — Set-and-forget unlimited automatic backup for a single computer, a long-standing consumer/SMB backup brand (OpenText). But whether it's cost, a missing capability, or just due diligence. Here are the strongest alternatives worth a look, with what sets each apart.
Each option below works in the same broad space as Carbonite; the right swap depends on which trade-off matters most to you.
~$8.99/mo Backup unlimited (1 PC); Pro Suite ~$25/mo adds Briefcase + multi-device
unlimited-backup
The alternatives in detail
Backblaze Cloud Backup
Unlimited personal computer backup for one flat price, plus B2 object storage that undercuts AWS S3 on price and egress. A good swap when you care most about personal-backup.
Unlimited single-computer backup paired with the cheapest mainstream S3-compatible object storage.
Stands out for:
Unlimited Personal Backup for one computer at a flat price (incl. attached external drives)
B2 Cloud Storage S3-compatible object storage at ~$6/TB/month
Free egress on B2 up to 3x average monthly storage, then ~$0.01/GB
Pricing: Personal Backup ~$9/mo or ~$99/yr unlimited (1 computer); B2 ~$6/TB/mo · Best for: personal-backup, developers
Backs up unlimited devices (PC, Mac, mobile, servers) into one account at a very low per-TB price, with disk-based courier recovery. A good swap when you care most about multi-device-backup.
Backs up an unlimited number of devices into a single low-cost account, repeatedly PCMag Editors' Choice.
Stands out for:
Unlimited devices (PC, Mac, Linux, mobile, servers) backed up into one account
Disk image backup and file/folder backup in one app
IDrive Express physical disk shipping for fast initial backup and recovery
Pricing: Free 10GB; ~$79.50/yr 5TB Personal (first year often discounted under $5), higher Team/Business tiers · Best for: multi-device-backup, value
Full disk-image backup combined with built-in anti-malware/anti-ransomware in one consumer cyber-protection product. A good swap when you care most about disk-imaging.
Full disk-image backup fused with built-in anti-ransomware in one cyber-protection product.
Stands out for:
Full disk-image backup and cloning, not just file backup
Built-in anti-malware and anti-ransomware (Active Protection) on higher tiers
Cloud backup storage on Advanced (~250-500GB) and Premium (up to 10TB) tiers
Long-standing zero-knowledge (No Knowledge) backup and sync where files are encrypted on-device before upload. Consider it if zero-knowledge-backup is your priority.
A pioneer of 'No Knowledge' zero-knowledge backup where everything is encrypted on-device first.
Stands out for:
'No Knowledge' (zero-knowledge) encryption: files encrypted on-device before upload
2048-bit RSA and 256-bit AES encryption
Backup, sync and share in one client
Pricing: ~$6/mo 150GB up to ~$29/mo 5TB (One Backup); pricing varies by plan · Best for: zero-knowledge-backup, privacy
Norwegian/EU backup with effectively unlimited storage (fair-use throttled) and strong privacy jurisdiction. Consider it if unlimited-backup is your priority.
Effectively unlimited EU backup from Norway-owned servers under strict privacy law.
Stands out for:
Effectively unlimited storage on the Personal plan (fair-use throttled past 5TB)
Norwegian/EU jurisdiction with company-owned servers in Norway
Automatic photo and folder backup from computer and mobile
Pricing: Free 5GB; ~EUR 8.99/mo Unlimited Personal (1TB full speed then throttled); Home/Business tiers · Best for: unlimited-backup, eu-privacy