> primary.getDB("admin").aggregate([{$backupCursor: {incrementalBackup: true, thisBackupName: "bar", srcBackupName: "foo"}}]);

 {
    "metadata" : {
        "backupId" : UUID("83f0327d-5194-4e14-b3bb-1c676450794d"),
        "dbpath" : "/data/db/job0/mongorunner/backup_cursor_format-0",
        "oplogStart" : {
            "ts" : Timestamp(1582568119, 1),
            "t" : NumberLong(-1)
        },
        "oplogEnd" : {
            "ts" : Timestamp(1582568162, 1),
            "t" : NumberLong(1)
        },
        "checkpointTimestamp" : Timestamp(1582568162, 1),
        "disableIncrementalBackup" : false,
        "incrementalBackup" : true,
        "blockSize" : 16,
        "thisBackupName" : "bar",
        "srcBackupName" : "foo"
    }
 }