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# Installation & configuration
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<br />
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## Create VM / install PBS
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**VM spec:**
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```properties
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DiskSize: 10GB
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CPU : 2 core 1 socket
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Memory : 2GB
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```
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**ISO install**
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Proxmox backup server ISO install. Follow install, nothing special to set
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<br />
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## Configuration
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### Configure VM datastore for PBS data
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By default you can't mount this directly, nor can you create a direct datastore and mount to the VM. So we need to use a `Directory Mapping` instead.
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1. Log into the web UI
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2. Setup Directory mapping
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1. Datacenter > Directory Mappings > Add
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```properties
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Name: vault-vm-backups
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Path: /vault/vm_backups
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```
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3. Update the VM mount the mapping
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1. Select the VM > Hardware > Add > Virtiofs
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```properties
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DirectoryId: vault-vm-backups
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```
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2. Reboot the VM
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4. Mount within the VM
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1. SSH into the VM
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2. Check the virtiofs mount was recognised by the VM ok
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```shell
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dmesg | grep -i virtiofs
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```
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You should see the name of the virtiofs ID that was added earlier `vault-vm-backups`
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3. Mount everything
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```shell
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mkdir -p /mnt/backup-data
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mount -t virtiofs vault-vm-backups /mnt/backup-data
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vi /etc/fstab
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# Add the following so it mounts automatically
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vault-vm-backups /mnt/backup-data virtiofs defaults 0 0
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```
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<br />
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### Configure PBS
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1. Log into the web UI
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2. Datastore > Add datastore
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1. Setup with properties
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```properties
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Name : Backups
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BackingPath : /mnt/backup-data
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PruneJobConfig: Keep last 4, keep 5 daily, keep 4 weekly, keep 2 monthly, keep 1 yearly
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```
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3. Select the datastore created > options > Verify new snapshots
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- `Enable`
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4. Setup the backup user to limit access between PVE and PBS
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1. Configuration > Access Control > Add
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```properties
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User : proxmox
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Password: Add one
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[Save to password manager as this will be forgotten in time]
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```
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2. Configuration > Access Control > Permissions > Add > User permission
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```properties
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Path: /datastore
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User: proxmox@pbs
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Role: Datastore admin
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```
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5. Get the certificate fingerprint for PVE registration
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1. Configuration > Certificates
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2. Copy the finger print for next section
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<br />
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### Configure PVE to use PBS
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1. Log into the web UI
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2. Setup the Proxmox backup connection
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1. Datacenter > Storage > Add Proxmox Backup Server
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```properties
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ID : vault-vm-backup
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Server : <IP to PBS>
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Username : proxmox@pbs
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Password : <proxmox@pbs password>
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Datastore : Backups (the datastore created within PBS)
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Fingerprint: <pbs fingerprint copied earlier>
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```
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3. Setup backup schedule
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1. Datacenter > Backups > Edit backup job
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```properties
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Storage : vault-vm-backup
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Schedule : '23:00'
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Selection mode: Include selected VMs
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[Unselect anything you don't want AND unselect PBS to avoid recursion backup]
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```
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4. Test backup is working
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1. Datacenter > Backups > Backup now
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_Note: The first backup is full (not incremental), any VM shutdown is always full backup, only online VMs that have at least one full backup will have incremental backups taken_