Folder synchronization for manual clouds
A Python 3.X/2.X script and tkinter GUI useful for managing backups and changes in multiple copies of large data sets (a.k.a. archives) stored in directory trees (a.k.a. folders).
mergeall is specifically targeted at quickly synchronizing changes in content mirrored across multiple devices such as laptops, tablets and USB flashdrives, and in some contexts can provide a manual alternative to cloud-based storage.
Compared to public clouds, mergeall replaces network servers with local devices, but requires you to run its synchronization process when needed. In exchange, it does not entrust your digital personal property to third parties with vested interests.
Note that this system changes a folder in-place by design, to make a destination tree the same as a source without exhaustive copies. As such, it should be used with care, though automatic backups and rollbacks of changes are available as options.