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# How to create a backup disk (for `soispha.services.backup`)
## Find the disk
```bash
lsblk -o "NAME,MAJ:MIN,RM,SIZE,RO,FSTYPE,MOUNTPOINT,UUID"
# or
sudo fdisk -l
```
## Check it
```bash
sudo smartctl --test=short /dev/disk
# or better:
sudo smartctl --test=long /dev/disk
# Run this to avoid a test timeout (otherwise the disk might go to sleep):
sudo watch --differences --interval 60 smartctl --log=selftest /dev/disk
```
## Add it
```
sudo mkfs.btrfs /dev/disk --label backup
```
And change the `backupUuid` to the uuid of the new disk.
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