Hello ,I have done my marriage under some called Sai vaidik vivah.... their sanstha is registered un

Hello ,I have done my marriage under some called Sai vaidik vivah.... their sanstha is registered under marriage acts ...first they performed all the rituals and during the rituals they clicked our picture later on they provided us marriage certificate and after that we went to one lawyer and he give us some notory papar like we done the marriage with witness details so my question is 1) is that certificate is valid without registration in marriage registrar officen2) somehow if we lost that certificate and notory thn will be able to proof our marriage without registration.3) if we didn't register our marriage just bcz the certificate which they provided us that sanshta is registered under government...so would it be valid every where or do we need to register our marriage as per government registrar officen4) where I can find marriage registrar office in any districtnnPlz ans my question it would really helpful for meThank you