No. RBackup uses lossless compression.

The compression technology used in our software is not the kind that causes data loss in pictures. All data is preserved in our compression scheme. If the picture format has compression in use already (like .jpg files) you wouldn't get much additional compression from our software, but again, this is not image compression, it is file compression so no image reprocessing is done at all. Your pictures will look just as good as the original when decompressed with our software.