>I wrote a little backup application which zips the data and then copies them over Citrix to a local drive.
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>The problem is that the backup and zipping get done in a couple of minutes, however the file copy can take anywhere between 10 and 60 minutes. I tried to copy the file using low-level file functions, and reporting the progress at about each 2.5% of the total. However, it seems that the OS simply queues copy requests - it reaches 100% in a couple of seconds, and only when I issue fClose() on the target file, it then waits whatever it takes until the actual copying happens. Which basically makes my progress indicator useless.
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>Is there any setting to have this deferred writing turned off, or should I just close and reopen the target file every now and then?

Uses you a buffered file ?