Proxmox Backup Server 4

The use of a separate Proxmox Backup Server for uploading backups from another Proxmox Backup Server on HDD-Housing may offer greater security against ransomware and attackers. The Proxmox Backup Server connected to HDD-Housing should be operated in pull mode. If operating in push mode is necessary, you can find the necessary permissions here: https://pbs.proxmox.com/docs/managing-remotes.html#sync-direction-push
If you want to backup multiple Proxmox Backup Server, use namespaces or create seperate buckets and a Datastore for each bucket.
Documentation Proxmox Backup Server: https://pbs.proxmox.com/docs/index.html
Create a bucket in Minio
By clicking 
Create Bucket in Webgui on the top left and name it 
pbs:
Configure HDD-Housing S3 Storage in Proxmox Backup Server 4
Note: How to get the fingerprint from self signed certificate is shown in Install Minio S3 Storage Server on Debian/Ubuntu
Create Datastore
mkdir /tmp/hddhousing_localcache
Click 
Add Datastore and configure to your needs, example:
Create namespaces
Use namespaces for Pull Sync Jobs
Remotes must be configured first, see screenshot below. Click the Help button for further assistance.