I need a programme built to work on a Mac

I have no idea if there are any Mac programmers on here, and as such I am unsure if I have selected the correct job types! Anyway, if anyone can do the following please bid - or point me in the right direction (is there a GAF-type site for Mac users?) I have a backup application, works flawlessly on Windows, but I have been asked for a Mac equivilent. Have a look at [login to view URL] and you will get more information on our product. If you think you can help please bid - the idea is for an automatic/automated/scheduled backup process not a web based solution. Thanks in advance.