This article will give some tips to find the origin of UnsatisfiedLinkError's in the backup client. This error occurs when java tries to load a native library (.so) but cannot do so bacause the library file cannot be found or cannot be loaded because of missing dependencies.
Both libraries must be in the installation directory of the Backup Client. Also make sure that the correct libraries are available for the architecture (32/64 bit).
depending on the architechture. The ldd command will then list all the library dependencies and also show which dependant libraries are not reachable. Any reported problems have to be addressed (e.g. missing libraries will have to be installed etc) before the Backup Client will start up properly.
 Or where java runs in 32 bit mode on a 64 bit system