Echosync

luminescence-software.org/en/echosync/about Backup & Recovery Website

Echosync synchronizes folders on Windows and can update a destination from a source; Echocli offers one-way sync for Windows and Linux.

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About Echosync

Echosync updates a destination folder from a source folder by applying only differences, for keeping a copy on an external drive or USB stick. It detects moved and renamed files, allows comparison before syncing, supports partial syncs, long paths over 255 characters and symbolic links, and can run in portable mode from the sync media. The Echocli command-line tool runs on Windows and Linux for automation.

Synchronization is one-way and the source is not modified. It does not merge changes made on both sides and does not keep multiple versions of a file. The graphical application requires Windows 10 64-bit or later; Linux use is through Echocli.

Key features

Updates destination from source using only differences
Detects moved and renamed files to avoid recopying
Runs in portable mode from external drive or USB
Copies locked files with VSS when run as administrator on Windows
Supports paths longer than 255 characters and symbolic links
Automates sync with Echocli on Windows and Linux

Best for: People who want to keep a one-way copy of folders on an external drive or USB stick.

Good for

Source folder is not modified and can be read-only
Can run without installation from the sync media itself
Applies only differences and avoids recopying moved or renamed files

Watch out for

Does not merge changes made on both sides
Does not keep multiple versions of a file
Graphical application requires Windows 10 64-bit or later; Linux use is command-line only