In accordance with embodiments, there are provided mechanisms and methods for facilitating customized overriding of data for maintenance of software applications in an on-demand services environment. In one embodiment and by way of example, a method includes duplicating first data of a first data set into a second data that is placed in a second data set. The first data relates to a software application at a computing device. The method may further include amending a portion of the second data at the second data set. The amended portion of the second data corresponds to an unchanged portion of the first data. The method may further include facilitating running of the software application based on the first data while referring to the amended portion of the second data and ignoring the corresponding unchanged portion of the first data.