Over the last few months I have been periodically testing cloud storage providers with paid and free tiers. While many of them offer free storage over 1GB, not many of them offer a robust CLI or API that could expand the usage of their storage systems. I was able to test remote storage with rclone, as it has an extensive list of supported providers. I did have to wait until the last month of the year for Alpine to update the rclone package to be able to test it with Proton Drive (it works).