Sync data in service backed record

I have implemented service backed record with daily sync enabled. But the data at the source(service) gets added frequently(in minutes) and the customer want to see the updated data in Appian once its get added at the source. I have gone through documentation where I saw "Sync Changed Data". Could someone help in achieving "Sync Changed Data"?

Additional Information:

1) Identifiers of the data being returned by the service are not sequential but random in ascending. (Identifier's are unknown if I need to use "Sync Record" smart service)

2) Full Data Sync takes around seven minutes. (for now there are around 180K records being returned by service, in prod it will be around 490k and will increase)

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