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Zimly: S3 Backup vs FolderSync: catalog facts
Zimly: S3 Backup	FolderSync
Free Free and open source under GPL-3.0-only.	Freemium The Android app is free; the desktop app has a 14-day trial.
Android	Windows, macOS, Linux, Android
Works with any S3-compatible storage Supports self-hosted MinIO and AWS S3	Supports more than 20 cloud providers Also syncs with SMB and SFTP targets
Requires your own S3 storage and credentials Android only	Desktop version is paid after a 14-day trial Proprietary software
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-only	License not stated
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 September 23, 2026

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