Maintaining replica file systems

A system for transitioning a replica of a file system, the system comprising:

• a memory storing computer-executable instructions;
• and
• a processor to execute the computer-executable instructions to:
• update a replica file system on a target data repository to be a replica of a source file system as the source file system existed on a source data repository at a point in time;
• wherein the replica file system is constructed of block objects at the target data repository that are different from block objects at the source file system prior to the updating, wherein the block objects at the target data repository are implemented as objects in an object store, store metadata for individual files and directories of the replica file system and support access to blocks of data of the target data repository associated with the files and directories of the replica file system at the target data repository;
• wherein the updating comprises updating the block objects of the replica file system to be replicas of block objects of the source file system as the block objects of the source file system existed on the source data repository at the point in time.