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Comet Backup vs Amanda: catalog facts
Comet Backup	Amanda
Paid Commercial software with a free trial.	Free The community edition is free and open source. Commercial editions are paid.
Windows, macOS, Linux, Self-hosted	Windows, macOS, Linux, Self-hosted
Covers Windows, Linux, macOS, hypervisors and Microsoft 365 Choice of Comet cloud, any S3 service or your own storage	Archives are written with standard tar or dump, so they are readable without Amanda Balances daily full and incremental runs across clients automatically
Aimed at businesses and MSPs rather than home users Pricing is not shown on the homepage	Configuration is dense and the documentation assumes Unix experience The interface is entirely command line
Downloadable app, Self-hosted, Hosted service	Self-hosted
Closed source	Open source
License not stated	License not stated
Account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.