HI Dinesh,
how to use Odata Plugin.. you can refer to Getting Started with Kapsel - Part 15 -- Offline OData (New in SP05)
Ideally, first time data will be fetched online. and will be stored offline store.
Next time onwards, it will try to fecth from the store, until there is no change in BE data. Once there is a change in BE data, Offline store will be synced with BE data. again next request data will be fetched from store only(provided no change in BE).
Regards,
MBR.