FreeFileSync Forum

So I believe I found the option in the GlobalSettings.xml that governs the warning you speak about.
<OptionalDialogs><WarnSignificantDifference Show="true"/>
This looks promising.
I guess I need to look up whether this will STOP the sync, because that's what I want.
And also how does this work when ...

I've been using FreeFileSync for years to backup my fileserver to another backup fileserver.
I use the Mirror (with versioning) Sync type, and it's been working nicely.
An automated script runs a sync at 3AM every day.
However, there was once a time when a ransomware virus invaded the main ...