{
    "catalog":"test/catalog/catalog1.json",
    "protocol":"cp",
    "backend":"/data",
    "tool":"/bin/cp",
    "url":"http://localhost:8989",
    "mfile":"metrics.log",
    "minterval":60,
    "verbose":0,
    "name":"Test",
    "staticdir":"static"
}

{
    "catalog":"test/catalog/catalog1.json",
    "protocol":"cp",
    "backend":"/tmp",
    "tool":"/bin/cp",
    "url":"http://localhost:8989",
    "mfile":"metrics.log",
    "minterval":60,
    "verbose":0,
    "name":"Test",
    "staticdir":"static"
}

Change value of backend field
Change value of backend field