AppBackup is royalty-free for all of your applications, can be incorporated into your application in under 5 minutes (REALLY!), can backup/restore to both hard drives and floppy disks of any size with automatic disk spanning if required, is fully PKZIP/PKUNZIP compatible, comes with both 16 and 32-bit versions, and fully supports long filenames in the 32-bit version.
In addition, AppBackup can be used with virtually ANY Windows-compatible programming language, including (but not limited to) Visual Basic, Delphi, Access, Paradox, Java, PowerBuilder, C/C++, Visual C++, C++ Builder, Visual dBASE, Visual FoxPro and more, in Windows 3.x, Windows 95/98, and Win NT.