This is an issue I'm having with the Backup Plugin. I didn't see it listed as
a "Subcomponent", so I picked a random one...

Hudson 1.323, inside Tomcat 5.5, on top of Server 2003
Backup plugin: 1.2

I've configured the Backup Manager to create a .ZIP file. Hudson is
successfully creating the file, but when I try to open it with Windows'
native .ZIP file support, I get the message "The Compressed (zipped) Folder is
invalid or corrupted." If I try to use WinZip, the error is "error: start of
central directory not found; Zip file corrupt. Cannot open file; it does not
appear to be a valid archive." The file being created is ~13GB, in case that
makes a difference.

I can't say this used to work but now doesn't – this is the first time I've
installed the Backup plug and tried to use it.