Offsite Backup strategy + security

Dear at all,

i have some questions regarding built up an offsite Backup with 2 PBS.

I have made an small drawing of the setup idea.


ETH2 should be only used for syncing between PBS1 and PBS2.
ETH2 is planed to put in an seperate Network to make it more difficult to enter the main Network which is connected on ETH1.
ETH1 is used for doing the backups from the PVE-Nodes.
Is PBS by default safe on the interface ETH2?
Or i must do my own firewall rules on...

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