> If I use Mirror to incrementally backup a branch from C:\Program
> Files (for example) to D:\Program Files, where most of the source files
> already exist at the unlogged destination, then Mirror currently cannot
> proceed if Ztree determines that (total size of all source files) > (free
> space at destination), even if there ultimately is enough free space at
> the destination.
>
> Anyone else think that it might be better to allow the user the option
> to proceed with the Mirror anyway, while keeping the warning?

I expect Alt-Mirror is seeing the destination as unlogged, and so unknown, so it has to assume that no files exist at the destination.

It might be better for you to switch to Branch, Ctrl-Tag, Alt-Copy.

Ben