You are probably thinking of /usr/share/applications which is full of .desktop files which is what the menu will read. If your program has created its own .desktop file (highly unlikely I would think) you could just drop it in this location. The likelihood is that you will have to write your own. They are just simple text files nothing more complicated. The easiest way is to look through your existing ones, find the simplest, copy and rename it to crashplan.desktop then alter the entries to suit crashplan. Name, Icon, Exec, Terminal and Type are about all you really need. My best guesses would be
Icon=(no idea, you will have to look for it, /usr/share/icons is the best place to look)
Exec=crashplan (try the command 'whereis crashplan' that might tell you if it is not as obvious as my guess
Fujitsu Lifebook AH532 Laptop. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Ubuntu12.10 (Unity), Mint14 (Cinnamon), Manjaro (Xfce).