You should take a look at the command line tools in ZeXtras, you can find details in the wiki (although they're not exactly up-to-date): https://wiki.zextras.com/wiki/ZeXtras_CLI#ZxBackup_CLI
I think you'll need to use the following (when you've started a backup via the cli or in the Web UI):
Code:
zxsuite backup monitor
command monitor requires more parameters
Syntax:
zxsuite backup monitor {operation_uuid} [attr1 value1 [attr2 value2...]]
PARAMETER LIST
NAME TYPE
operation_uuid(M) Uiid
operation_host(O) String
(M) == mandatory parameter, (O) == optional parameter
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