My favourite app, FreeFileSync, in Linux version, normally will crash during syncing. The reason is not really known, only know that it is related to gtk+ or gtkmm. That means, FreeFileSync is not able to solve the problem.

So, normally, I need to sync several times, around 2 or 3 times to complete the syncing. First syncing will suddenly crash the application. Then I need to sync again, because the first syncing is not yet complete, there are some more files need to be synced. Sometimes, second time also crash, that is why I need do the syncing about 3 times.