Kabeer,

Please refer below given link. it will add more clarification.

https://www.odoo.com/forum/help-1/question/odoo-as-a-saas-91871

Thanks.

Hi Kabeer,

Do you mean that you are testing the Odoo SaaS 15 day trial and then later want to switch to on-premise with the database?

If that is your question, you can surely do it. There are 2 ways to get it done:

1) You can ask Odoo to help you switch from SaaS to On-premise and they'll help you do it for free.

2) Contact Us so that we can help you make the switch

As far as custom modules are concerned, the SaaS version has several limitations when it comes to using the custom code. If you plan to have customized modules on your Odoo, it is best advised to use on-premise.