QNAP VS-2004L en - Manual (Page 190)

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6.6.3 Schedule Settings
Select continuous recording or scheduled recording. The default setting is continuous
recording. To set up a recording schedule, select a camera number on the list. Then
select the date and time and click ‘Add’. Click ‘Apply’ to save the settings for the particular
IP camera or click ‘Apply to all cameras’ to apply the settings to all the IP cameras. To
delete a schedule, click ‘Remove’ on the schedule list.
Note:

Up to 15 schedules can be added.

All the settings will not take effect until ‘Apply’ is clicked. When applying the changes,
the recording will stop for a while (maximum 1 minute) and then restart.