FreeFileSync Forum

Thanks for your explanation, I understand it now

From the Manual page
The lock files are only recognized by FreeFileSync and make sure that at most, a single synchronization is running against a certain folder at a time while other instances are queued to wait. This ensures that only consistent sets of files are subject to synchronization. The ...

You can prevent the ffs_lock files being created by setting the LockDirectoriesDuringSync flag to False. But be aware of the risk.

With the LockDirectoriesDuringSync flag set to True, the ffs_lock file is created at the start of an FFS sync, and removed upon its completion.
However, some cloud ...

After a lot of hours I think I managed to get the right configuration.

However, I'm wondering if "sync (1).ffs_lock" and "sync (2).ffs_lock" do need to be always visible in one of my three folders? Or is it possible to hide these two FFS_LOCK-files somehow?

Thanks for your answer @dennisb

So you can't synchronise these 3 maps at the same time?

I have 3 identical folders:

(1) Google Drive
(2) Microsoft OneDrive
(3) Double Drive

My intention now is to use FreeFileSync and RealTimeSync to get all these 3 folders synchronised with each other.

So if something is modified in (1), (2) or (3), I want it to be automatically modified in the ...