I don't know who needs to hear this, but you can download all the music you uploaded by starting a draft of a Bandcamp subscription service (after buying something to create an account and profile if you don't have one). All your albums will be added to your personal collection. I suggest FLAC.

edit:

Magic trick: open one (1) album. Change it to FLAC. Download.

Now FLAC is default for the others you open.