The above setup is used for a backup server which regularly backs up all Raspberry Pis in a rolling backup on a daily and monthly basis. The installation script can be found on Github.
I have several PIs installed in my home. One of them acts for example as Nextcloud server and resides in a DMZ.
In such a setup, servers pushing into the private zone pose a security threat. To overcome this, another server/PI resides in the private zone and cyclically pulls the data such as pictures and logs in.
The backup PI uses CRON jobs and scripts to do a backup every day and month. It hereby keeps data for 12 months in a rolling backup.
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