Why do NAS devices have multiple USB ports?

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Why do NAS devices have multiple USB ports?

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DS213, DS224+
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  1. Windows
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  1. Android
This is almost certainly a naïve question, but why do NAS devices have multiple USB ports?

My 2-bay Synology NAS has 3 USB ports. I only make use one of these to periodically connect a USB drive and backup the NAS to it. So I could get by with a single port. But presumably there are use cases that necessitate having multiple ports. I just can't think what they are, and would be grateful if someone could fill me in!
 
Secondary USB-to-ethernet adapter for an additional NIC. Another reason (for the front USB) is the use case when USB Copy package is part of your process. Multiple USB devices, as backup destinations. All those cases would benefit from a multiple USB setup
 
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I have two hard drives attached at all times for scheduled weekly backups. I also connect a third for offsite backup of important data periodically. As noted, a NIC is another case where some people use USB.
 
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How do you monitor your UPS?

Don't have one!

UPS communication and USB ethernet adapters are a couple of things I hadn't thought about. I suppose if I used both of those things then I would definitely need at least 3 USB ports.
 
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Don't have one!

UPS communication and USB ethernet adapters are a couple of things I hadn't thought about. I suppose if I used both of those things then I would definitely need at least 3 USB ports.

If you don't have a UPS I would highly recommend getting one. Unexpected crashes aren't good for any computer, but I'd be especially concerned for my storage array. UPS'es do more than just help during a power outage. Mine kicks in regularly filling in for irregular power situations as well. UPS'es can be had pretty cheap so it's a good insurance policy for your NAS.
 
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