Easy to restore database here is some step to follow 

Hello everyone, 
For future issues, if you're still attempting to resolve this. 
As prior users has mentioned, it is a compatibility issue for the addons. 
What you can do is delete the prior addons and use a command like  git clone --branch saas-17.2 --single-branch https://github.com/odoo/odoo.git addons to replace it, if it does not work or your odoo instance is still unstable, i suggest reinstalling odoo to the same version your online odoo had. (You can check what version your database is by clicking the gear icon on my databases section, and it shows in blue.)
Hope this helps!

Hello,

If you are using odoo online and trying to restore that DB on your local system then make sure odoo online and your local setup have the same version of addons.

Odoo online have a different version of odoo.
For ex, sass-16.2, sass-16.4

Thanks,
info@creyox.com

Hi,
Please refer the below forum answer
https://www.odoo.com/sl_SI/forum/pomoc-1/how-to-restore-database-from-backup-in-v16-online-217656#:~:text=In%20the%20%22Restore%20a%20database,the%20%22Restore%20Backup%22%20button.

You can also go through our blogs

https://www.cybrosys.com/blog/how-to-restore-a-database-in-odoo-16-erp

Hope it helps