I-O DATA HFAS1-XS20U Setup Manual page 20

Using a USB hub and two USB HDD units.
If you use a USB hub, you can connect two USB HDD units, one for shared use and one for backup use.
* We recommend a type of USB HDD that is connected to an electrical outlet for most types of USB hub.
* Even if you connect two or more USB HDD units for the same application (for shared use / for backup
use), you will not be able to use them.
* Please see 2.3. Streaming Music on a USB HDD as it is (page 10)
Removing the USB HDD.
Please see 2.2.3. Removing the USB HDD (page 8).
If you reconnect a USB HDD for backup to this unit, it automatically starts backing up music.
If you do not want to always connect a USB HDD for backup, we recommend that you connect it
occasionally to back up your music.
2.7.3. Restoring Music from a USB HDD for Backup
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Connect a USB HDD for backup to a USB port on the back of this unit.
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2.1. Open the Settings Screen
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Go to [Table of Contents]
2. Getting More out of this Unit – 2.7. Backing Up Music
for details of how to share a USB HDD.
Click [USB DEVICE SETTINGS]
Click [Restoration of backup data]
Click [NEXT]
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