Discrete Cosine Transform (DCT), Huffman Coding, Discrete Wavelet Transform (DWT), Lempel-Ziv-Welch (LZW), Run-Length Encoding (RLE), Bit Packing, Delta Encoding, Autoencoders and Generative Adversarial Networks (GANs) are just a few of the metadata compression methods that are thoroughly reviewed in this survey paper. We concentrate on their main trade-offs, applications and methods. A comparison based on performance measurements and projected trends in further research rounds up this report.