Systems and methods for file management by mobile computing devices. An example method, performed by a computer system, may comprise: storing, by a computer system, a first file having a first size, in a memory; storing, in the memory, a second file derived from the first file, the second file having the second size, the second size being less than the first size; determining that the memory is not sufficient to perform a memory write operation; selecting a third file having a fourth file associated with it, the fourth file derived from the third file; and removing the third file from the memory.