500GB isn't a lot of data, and $3K/month seems like an extortion for that little data.
Having said that, MongoDB pricing page promises 99.995% uptime, which is outstanding, and would probably be hard to beat that doing it oneself, even after adding redundancy. But maybe you don't need that much uptime for your particular use case.
That works for up and down. But what about side to side? I don't know anyone who inverts left/right. If the lever was at the back of the head, won't left/right be inverted too?
If enough time or technology has passed that someone has to write a wav parser, how do you expect them to mount your file system, assuming it has survived?
Audio CDs have less error correction than CD-ROMs. When you rip an audio CD, the drive is doing the error correction, and may give you PCM data different from what was written on it. Software like ExactAudioCopy tries the best it can, but that’s exactly that. Reading CD-ROM data is different. You can get an iso image of a data cd, but not an audio one.
This was done to both increase play time and discourage copying.
So since you’ll never get the raw redbook data off a cd, there is no reason to prefer WAV over FLAC for CD audio.
Having said that, MongoDB pricing page promises 99.995% uptime, which is outstanding, and would probably be hard to beat that doing it oneself, even after adding redundancy. But maybe you don't need that much uptime for your particular use case.