FolderSync vs rsync

FolderSync moves files between folders on a device and cloud services or file servers, and it can also sync folders stored on the same device. One-way sync mirrors a source to a destination; two-way sync is also supported. It can transfer files between two remote locations through an Android device or desktop computer, which temporarily holds the files. Connections include Google Drive, Dropbox, OneDrive, Box and Nextcloud, along with FTP, SFTP, SMB, S3-compatible storage and WebDAV. Its V2 engine adds encryption, pre-sync change analysis, parallel transfers and Cron-based scheduling. FolderSync also supports Tasker integration and configurable events such as schedules and syncs. Encryption protects file names and contents before upload, but works only with one-way sync; a lost encryption password cannot be recovered. FolderSync says account, folder-pair and sync-log data stays on the device, while files go directly to the configured service or server. A free plan is available. Android requires version 8.0 or newer; desktop support covers Windows 10 or newer, macOS 10.15 or newer, and qualifying 64-bit x86 Linux systems.

rsync has no write-up on Specifiction yet; its figures are above.