Someone contributed an nbdkit S3 plugin which basically works the way you described. It uses numbered S3 chunks using the pattern "key/%16x", allowing the virt

Someone contributed an nbdkit S3 plugin which basically works the way you described. It uses numbered S3 chunks using the pattern "key/%16x", allowing the virtual disk to be updated. (https://libguestfs.org/nbdkit-S3-plugin.1.html https://libguestfs.org/nbdkit-S3-plugin.1.html https://gitlab.com/nbdkit/nbdkit/-/tree/master/plugins/S3 https://gitlab.com/nbdkit/nbdkit/-/tree/master/plugins/S3)