How to keep two folders automatically synchronized?

Question

I would like to have a synchronized copy of one folder with all its subtree.

It should work automatically in this way: whenever I create, modify, or delete stuff from th

Answer 1

I use this free program to synchronize local files and directories: https://github.com/Fitus/Zaloha.sh. The repository contains a simple demo as well.

The good point: It is a bash shell script (one file only). Not a black box like other programs. Documentation is there as well. Also, with some technical talents, you can "bend" and "integrate" it to create the final solution you like.