# Solution

## First alternative solution

### The udev rule

```
➜  ~ git:(master) ✗ cat /etc/udev/rules.d/99-backup_to_usb_stick.rules 
SUBSYSTEM=="block", ENV{ID_FS_UUID}=="2469ffe5-e066-476d-805a-cde85a58ea3b", ACTION=="add", TAG+="systemd", SYMLINK+="backup_partition"
➜  ~ git:(master) ✗ 
```

### The device file

```
➜  ~ git:(master) ✗ cat /etc/systemd/system/dev-backup_partition.device 
[Unit]
Description=my device
Wants=tester.service
➜  ~ git:(master) ✗ 
```

### The service file

```
➜  ~ git:(master) ✗ cat /etc/systemd/system/tester.service 
[Unit]
Description=A tester
Requires=dev-backup_partition.device
After=dev-backup_partition.device

[Service]
ExecStart=echo "test"

[Install]
WantedBy=default.target
➜  ~ git:(master) ✗ 
```

## Second alternative solution

Can be done via mount files as well.

### The udev rule

```
➜  ~ git:(master) ✗ cat /etc/udev/rules.d/99-backup_to_usb_stick.rules
SUBSYSTEM=="block", ENV{ID_FS_UUID}=="2469ffe5-e066-476d-805a-cde85a58ea3b", ACTION=="add", TAG+="systemd", SYMLINK+="backup_partition", RUN{program}+="/usr/bin/systemd-mount --no-block --automount=yes --collect $devnode /media/backup_stick"
➜  ~ git:(master) ✗ 
```

### The mount file

### The service file