US Patent 10037251 File system rollback to previous point in time

A technique for performing continuous data protection and point-in-time recovery for file systems includes performing continuous replication to maintain a replica of a file system by writing changes in the file system to a journal and then writing the changes from the journal to the replica. In response to receiving a request to roll back the replica to a previous point in time, the technique accesses the journal to identify changes made to the replica since the previous point in time and performs undo operations to undo the identified changes and restore the replica to its state at the previous point in time.