Hello,

Generally, the Odoo POS will work offline as well. You just need an internet connection to open the POS session. Then, even if you don't have an internet connection, you can still do the transactions, and when the internet connection is back, it will be synchronized. 

You can check this out at https://www.odoo.com/app/point-of-sale-shop

https://www.cybrosys.com/blog/odoo-pos-point-of-sale

can i do an alternative solution by syncing the database locally hosted to odoo online or odoo-sh? is that even possible?