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A follow up.

The problem started the day I tried to use iTunes on a Windows box to set up my new iPhone 7+. iTunes wouldn't do a backup of the 6+ so I ended up doing the i7+ setup with iCloud backup.

Something on that windows box hammered the network, personally I think it is some process that got started that won't quit and starts back up when the machine is turned back on. So currently that box is off and will remain so until the start of a new cycle when I'll virginize it and sell it on Craigslist! Since its sole use was as a host for my iTunes library it isn't needed any more.

In fact I see no reason at all to use iTunes. Other than a few purchased movies and a few DVD rips, there isn't much in it anyway. And iTunes isn't needed, or at least I don't think it is. If it turns out I'm incorrect I'll get a used/refurbed Mac Mini to do it with.

For info, before I finally figured out what was doing it the data usage in those 3 days was 1.6 TB!
 
A follow up.

The problem started the day I tried to use iTunes on a Windows box to set up my new iPhone 7+. iTunes wouldn't do a backup of the 6+ so I ended up doing the i7+ setup with iCloud backup.

Something on that windows box hammered the network, personally I think it is some process that got started that won't quit and starts back up when the machine is turned back on. So currently that box is off and will remain so until the start of a new cycle when I'll virginize it and sell it on Craigslist! Since its sole use was as a host for my iTunes library it isn't needed any more.

In fact I see no reason at all to use iTunes. Other than a few purchased movies and a few DVD rips, there isn't much in it anyway. And iTunes isn't needed, or at least I don't think it is. If it turns out I'm incorrect I'll get a used/refurbed Mac Mini to do it with.

For info, before I finally figured out what was doing it the data usage in those 3 days was 1.6 TB!

I could not restore my iPhone 7 using iCloud, had to use iTunes.
 
I could not restore my iPhone 7 using iCloud, had to use iTunes.
My try to do it with iTunes wouldn't work because iTunes wouldn't backup the iPhone 6+. Kept giving an error saying the iPhone 6+ had disconnected. Read in other places that this wasn't uncommon. So I did the iCloud restore since it was current from the i6+.
 
A follow up.

The problem started the day I tried to use iTunes on a Windows box to set up my new iPhone 7+. iTunes wouldn't do a backup of the 6+ so I ended up doing the i7+ setup with iCloud backup.

Something on that windows box hammered the network, personally I think it is some process that got started that won't quit and starts back up when the machine is turned back on. So currently that box is off and will remain so until the start of a new cycle when I'll virginize it and sell it on Craigslist! Since its sole use was as a host for my iTunes library it isn't needed any more.

In fact I see no reason at all to use iTunes. Other than a few purchased movies and a few DVD rips, there isn't much in it anyway. And iTunes isn't needed, or at least I don't think it is. If it turns out I'm incorrect I'll get a used/refurbed Mac Mini to do it with.

For info, before I finally figured out what was doing it the data usage in those 3 days was 1.6 TB!
A little off topic but what version of windows is your windows machine running. If it's 8 or higher make sure you disable fast boot up. That will allow the computer to fully restart and fix any broken programs.
 
My try to do it with iTunes wouldn't work because iTunes wouldn't backup the iPhone 6+. Kept giving an error saying the iPhone 6+ had disconnected. Read in other places that this wasn't uncommon. So I did the iCloud restore since it was current from the i6+.

You might have to do a test where you unplug and leave your router off for a full day and see if the carrier sees the data usage stop. If it doesn't then the issue is on their end and not yours.
 
You might have to do a test where you unplug and leave your router off for a full day and see if the carrier sees the data usage stop. If it doesn't then the issue is on their end and not yours.

Since data use is now where it should be, the issue is solved at least for the time being.

But I did do that for 1/2 day and the data stopped so I knew it was on my side of the router. They update their usage meter at least twice a day so that worked.

Thanks for the suggestion
 
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