In theory, the key advantage of INCD and similar is that an RW disk is like a giant floppy disk. You can save/read data to and from the disk in the same way you read data to/from a floppy or hard disk. You can easily incrementally add data. The main point is that there is no need to access the burning software e.g. nero burning rom each time you want to save a file.
It is really better suited to data applications etc whereby you are continually changing the data on the disk (much as you do with a hard drive).
For back-up applications, video/audio applications, INCD is not really the best idea. Conventional disk formats are probably better.
However, nowadays since hard disk storage is so large, and USB pens are a very convenient way of transferring large quantities of data, I doubt here is any great advantage any more of using INCD.
Given the reliability issues, I would avoid INCD these days. If you want safe and reliable easy data transfer use a USB pen.