Terry asks:

> We have a project that requires we mirror a folder structure on two
>  servers.
>  This is a 'one way' mirror application.  By that I mean we want to have
>  the files on server A, update the
>  files on server B every night.  Any changes to the files on server B
>  will be overwritten.
>  
>  Does anyone on the list have a tool for this they recommend?  I have a
>  limited amount of bandwidth available, so
>  a 'dumb' copy isn't a viable option.   The solution has to be smart
>  enough to recognize when a file hasn't been updated
>  and skip that file.
>  A block level check would be great, but those seem a bit pricy and we
>  are on a budget.

If your servers are Windows-based PCs, we do that here with two products, 
FTP-Voyager and Serv-U:

     http://www.ftpvoyager.com/

The combination works extremely well. The programs only transfer over the 
modified files every night, checking for both size and time modifications. More 
than that, for some of the really big but less important comparisons, multiple 
scripts can be instituted so that some folders are checked every night, others 
once a week, and others yet again only once a month.

Because the PC you're transferring to is already a server, you technically 
don't need the Serv-U receiving end software, but I'd strongly recommend it 
anyway because the Voyager products support a time synchronizing standard, MDTM, 
that most UNIX/Linux servers don't, and because they don't, things can get 
really bolixed up when backups of the backups have to be restored to the receiving 
server.

Wirt Atmar

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