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Duplicati vs Kopia

Duplicati lands on Depends, and Kopia lands on Worth it.

Kopia

kopia.io

Worth it
Confidence: Medium

Free, fast, encrypted open-source backup that technical users and self-hosters love.

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Duplicati versus Kopia
CompareDuplicatiKopia
VerdictDependsWorth it
Best forHomelab and self-hosting usersSelf-hosters and NAS owners
Who it's not forBusinesses needing vendor SLAs or support contractsNon-technical users wanting set-and-forget backups . use Backblaze or Time Machine
PrivacyClient-side AES-256 encryption by design, but 2026 CVEs (privilege escalation, permission issues) require prompt patching.11Encrypted by default; one critical server RCE (CVE-2026-45695) fixed in 0.23.0 . run the latest version.
Support qualityCommunity forum only; no vendor SLACommunity forums only; no paid support
Public sentimentUsers praise the free, powerful encrypted backups while repeatedly complaining about reliability and trust issues.⁹Overwhelmingly positive among self-hosters and technical users who praise its speed, with a minority reporting defaults and performance issues.
Biggest gotchaRestores matter most; Reddit reports of failures mean you must test restores regularly⁸Patch to 0.23.0+ before running Kopia server; unauthenticated RCE (CVE-2026-45695)

Pick Duplicati when

  • Homelab and self-hosting users
  • Personal PC backup to cloud storage
  • Zero-knowledge encrypted backups on a budget
  • Technical users comfortable troubleshooting

When Duplicati is not a fit

  • Businesses needing vendor SLAs or support contracts
  • Non-technical users who won't verify restores
  • Compliance-driven orgs needing audited security
  • Anyone wanting paid, on-call vendor support

Pick Kopia when

  • Self-hosters and NAS owners
  • Multi-OS households and small offices
  • Developers backing up to S3/B2
  • Privacy-focused users wanting encrypted dedup

When Kopia is not a fit

  • Non-technical users wanting set-and-forget backups . use Backblaze or Time Machine
  • Businesses needing vendor SLAs and support contracts
  • Anyone who won't promptly patch an internet-exposed Kopia server
  • Guess: enterprises needing certified compliance and managed backup

Sources

  1. Duplicati official siteduplicati.com
    official
  2. Duplicati pricing plansduplicati.com
    official
  3. duplicati/duplicati on GitHubgithub.com
    official
  4. ITPro: Our new favourite backup toolitpro.com
    review
  5. Cloudwards Duplicati Review 2026cloudwards.net
    review
  6. Backblaze: Deduped, Compressed, Encrypted Backupsbackblaze.com
    review
  7. XDA Developers: I should have started soonerxda-developers.com
    review
  8. Reddit: duplicati has crossed me for the last timereddit.com
    review
  9. Reddit: Is duplicati still bad?reddit.com
    review
  10. CERT VU#847406kb.cert.org
    security
  11. CVE-2026-16157 privilege escalationsentinelone.com
    security
  12. CVE-2026-76159 permission issuerapid7.com
    security
  13. Open Core Ventures: Duplicati Inc launchopencoreventures.com
    news
  14. Forum: Had high hopes but wound up uninstallingforum.duplicati.com
    review
  15. Kopia official sitekopia.io
    official
  16. Kopia GitHub repositorygithub.com
    official