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Zimly: S3 Backup vs Exfilac: catalog facts
Zimly: S3 Backup	Exfilac
Free Free and open source under GPL-3.0-only.	Free Free and open source under the ISC license.
Android	Android
Works with any S3-compatible storage Supports self-hosted MinIO and AWS S3	Works with S3-compatible and self-hosted storage Can upload on a schedule or device events
Requires your own S3 storage and credentials Android only	Uploads files to S3-compatible storage
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: ISC
No account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 8, 2026

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