Backup (Mirror Source to Target)

[bjelvert]

I am doing a backup from a source system to a target system that exist on a slow network line in a other location. To make this copy faster I brought a USB disk to the target location and manually copied the whole structure into the disk ( to save time and bandwith). Then I set up a ViceVersa job that should do a Backup (Mirror) to target.
Initially it should NOT be so much that differ, I thought. Only the small differents should be copied over the slow network.
I was suprised that the whole Target was DELETED before the job started to copy all the files again. Now doing a complete copy of everything.
That will take weeks.
My question is. Why?
Shouldn't Backup(Mirror) check what is on Source and what is on Target and copy only the new things in Source.....
I don't want to use syncronisation, becase if something happens with the target structure I don't want that error to be replicated back to Source. I only want one way. But I do want file deletions to be copied into Target, then I can not use Replication. So why doesn't Backup work?
Thanks

[TGRMN Software]

USB disk are usually formatted as FAT and that file system does not keep time zone information properly. If you compare source and target in ViceVersa, you can check if the file timestamps are matching. thanks
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