Which solution to choose for working with Servers?

Question

linux

Good day, help me decide on the choice of solutions.
There is a network for 25 PCs, 3 proxmox nodes in which 10 vm is spinning from 10GB to 4TB.
Task
Organize a centralized backup system with the ability to replicate certain backups to external clouds ala s3.
At the moment, everything is backed up from proxmox to us, but the work of us is not so hot.
I would like to do, for example, 1 reference backup of machines and backups of data from these wheelbarrows with a depth of 3 days.
What software is better for backing up MSSQL, PostgreSQL, exchange, and user data bases.

Answer 1

Bacula

Answer 2

Thank you all, the choice is made in favor of veem