Is Qurbani obligatory and what should i do for years of missed Qurbani?

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O Allah, send a perfect prayer and complete greeting of peace upon our master Muhammad - the one by whom problems are solved, and anxieties are relieved, and needs are fulfilled, and aspirations are attained and good endings are received, and by whose noble face the clouds give rain - and upon his Family and Companions, with every glance and every breath, by the number of everything that is known to You!