Comet Backup vs Kopia
Comet Backup
cometbackup.com
Kopia
kopia.ioSide by side
| Figure | Comet Backup | Kopia |
|---|---|---|
| Price from | $19/mo | Free |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 10 | 1 |
| Spec score · Backup software | 9.3 (#3) | 8.5 (#39) |
| Spec score · NAS Backup Software | 9.1 (#4) | 8.4 (#17) |
| Spec score · Cloud Backup Services | 9.1 (#5) | 8.4 (#19) |
| Backup scope | The feature comparison lists workstation, server, NAS, virtual-environment, SaaS, database, file-and-folder and system-state backup options. | file |
| Computer backup | Yes | Yes |
| Encryption | Comet says data is encrypted before storage, during transfer and at rest, using AES-256-CTR with Poly1305 authentication. | Kopia encrypts backup data and filenames before they leave the machine, and supports AES-256 and ChaCha20. |
| Free plan | No | Yes |
| Incremental backups | GetApp reports that backups are incremental forever and that older snapshots can restore as quickly as recent ones. | Snapshots are incremental, and content deduplication avoids storing duplicate file content more than once in a repository. |
| Supported platforms | web,windows,macos,linux,self_hosted | windows,macos,linux |
| Ransomware protection | The official comparison includes ransomware protection with S3 Object Lock as a security feature. | Yes |
| Restore modes | mixed | mixed |
| Server backup | Yes | Yes |
Plans
Comet Backup
- Starter$19 a month
- Growth$49 a month
- Professional$49 a month
- Advanced$99 a month
- EnterprisePrice not published
- Starter$19 a month
- Growth$49 a month
- Professional$49 a month
- Advanced$99 a month
- EnterprisePriced on request
In their own words
Comet Backup
Comet Backup has no write-up on Specifiction yet; its figures are above.
Kopia
Kopia is an open-source backup and restore tool that creates encrypted snapshots of selected files and directories. Snapshots are incremental, and content deduplication stores duplicate file content only once in a repository. Policies can schedule snapshots, set exclusions, define retention, and apply compression. Recovery options include mounting a snapshot as a local disk, restoring an entire snapshot to a chosen location, or selecting individual files. Kopia encrypts data and filenames before they leave the machine, supporting AES-256 and ChaCha20. Storage can use Amazon S3 and compatible services, Azure Blob Storage, Backblaze B2, Google Cloud Storage, WebDAV, SFTP, local or network storage, and some Rclone providers; Rclone support is experimental. Reed-Solomon error correction and repository consistency checks address data integrity. CLI and GUI interfaces are available, with optional server mode and an API for managing multiple machines. KopiaUI provides a web application in server mode. The software is free, but storage must be provisioned and paid for separately.