Folder synchronization tool SyncToy hits version 2.1
Like earlier versions, SyncToy 2.1 lets you create folder pairs and decide how data will be synchronized between those two folders. In Synchronize mode, when changes are made in one folder they'll be reflected in the other. If you add a file to folder A, it will be added to folder B. Delete one from B and it'll disappear from A.
Echo mode makes sure that folder B is always up to date with folder A. But if you make changes to folder B, they won't be reflected in the first folder.
In Contribute mode, files will copied from A to B and any files that are renamed in A will be renamed in B. But no files will be deleted. So if you delete a file from folder A it will still live on in B.
All three modes are pretty handy for making sure you have a backup of your important data. You can backup your files to a local drive or a shared network drive for safe keeping.
Probably the closest thing to a new feature in SyncToy 2.1 is the ability to backup your folder pair configurations. Microsoft also says that version 2.1 features better performance, faster copy speeds, and more resilience against network and file system errors. A few bugs have also been fixed, including one that could lead to data corruption when using NAS drives.
SyncToy 2.1 is available as a free download for Windows computers.