I have been using Macrium Reflect instead of a sync program because I can automate it. I started with the free version which is primarily for an entire drive. It does the trick, you can enter an *image* to find a folder. I updated to the paid version during a Black Friday sale. The paid version enables individual or groups of folders. I automate daily file folder backups, they take about a minute. Automation is less work for me and I have stopped syncing folders.
I found a good RoboCopy site but I don't have it handy. There are many. RoboCopy has a lot of options. This is the command I used to sync a pair of file folders. I type command prompt in the lower left corner of Windows and select run as administrator and then type or paste this command, one tiny typo and the command does not work as expected...robocopy E:\pending N:\pending /mir /copyall
I found a good RoboCopy site but I don't have it handy. There are many. RoboCopy has a lot of options. This is the command I used to sync a pair of file folders. I type command prompt in the lower left corner of Windows and select run as administrator and then type or paste this command, one tiny typo and the command does not work as expected...robocopy E:\pending N:\pending /mir /copyall