Multi company's separate Backups


Does anyone know how to obtain separate company backups from a multi-company setup? Let’s say I have set up companies like A, B, C, and D. I need to get a backup of company A. Also, please let me know how we can allocate Naming Series separately for each company because all companies’ naming series are showing when we log in separately.

Example: When I log into Company A, other companies’ naming series are also visible