Abstract: Techniques for backing a file system with a cloud-based object store are disclosed. In some embodiments, a computer system performs operations comprising: receiving, by a user space file system, a first request to write a first set of data to a file; based on the receiving of the first request to write the first set of data to the file, writing, by the user space file system, the first set of data to the file in a cloud-based key-value object store; receiving, by the user space file system, a second request to read a second set of data from the file; and based on the receiving of the second request to read the second set of data from the file, fetching, by the user space file system, the second set of data from the file in the cloud-based key-value object store.