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# Backup Role
Mounts a dedicated backup drive on the target host.
## Overview
Prepares a dedicated storage device as the local backup destination S3-compatible object store (ex. Garage).
## Configuration
### Required Variables
```yaml
backup_device: "PARTLABEL=backup" # no default — must set in host_vars
```
### Optional Variables
```yaml
backup_mount_point: "/mnt/backup"
backup_fstype: "ext4"
backup_mount_options: "defaults,noatime"
```
## Preparing the Drive
### 1. Install parted
```bash
sudo apt install parted
```
### 2. Partition with a named label
```bash
# check device name
lsblk
# create GPT partition table + single labeled partition
sudo parted /dev/sdX --script mklabel gpt mkpart backup ext4 0% 100%
sudo parted /dev/nvme0nX --script mklabel gpt mkpart backup ext4 0% 100%
# verify label
sudo parted /dev/sdX print
sudo parted /dev/nvme0nX print
```
### 3. Format as ext4
```bash
sudo mkfs.ext4 /dev/sdX1
sudo mkfs.ext4 /dev/nvme0nXp1
# verify
sudo blkid /dev/sdX1
sudo blkid /dev/nvme0nXp1
ls /dev/disk/by-partlabel/
```
### 4. Set host variable
In `host_vars/rpi5.local.yml`:
```yaml
backup_device: "PARTLABEL=backup"
```
`PARTLABEL` is stable across reboots regardless of device enumeration order (`/dev/sda` vs `/dev/sdb`).
`ansible.posix.mount` handles `PARTLABEL=` values natively.
## Notes
- `noatime` mount option reduces unnecessary write cycles on the drive
- Role adds a persistent fstab entry — drive auto-mounts on reboot
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