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Arq vs BorgBackup: catalog facts
Arq	BorgBackup
Paid Paid software with a 30-day free trial.	Free Free and open source, with no paid edition.
Windows, macOS	Linux, macOS, Command line
Back up to your own cloud storage or local disk End-to-end encryption	Content-defined chunking that survives files being renamed, moved or shifted around Authenticated AES encryption, so an untrusted backup server only ever sees ciphertext
No Linux version Cloud storage is billed separately by your provider	Primarily a Unix tool; on Windows it needs WSL or Cygwin rather than a native build Borg 2 is still in beta, ships breaking changes between betas and should not hold production backups
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: BSD-2-Clause
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 20, 2026

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