anyone who can assist with support for linking rubyrep and odoo

[Showline Solutions]

l would like to get assistance with support for any module or app that can do db synchronization , l have a local host database which l want to link with the online odoo instance they are both running odoo 14 community and l am using personal hosting so the setup goes like this , l have two grocery shops so l would like to see whats happening in both shops but the challenge is that when internet is down at the shops they cant work so l wanted to use multi-db sync so that when internet is down the people at shop can continue working when internet is down and when internet is back it can synchronize