sometimes archive.org can be used (it was used as jamendo backend for some time), but for personal files its probably will not work (also its not open source)
disroot.org has 1gb/30day free uploads (and its open source)
ideally for such needs it would be IPFS but ipfs is not very mature now and files are not really permanent (you need a pin-service to be sure they're permanent)
pinata is such service (
https://pinata.cloud/pricing) and they have 1gb free tier (but i didn't try them)