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Acronis TrueImage 2014 backup to networked My Cloud drive causes high Internet usage

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I have Acronis TrueImage 2014. I have several backups defined. Some back up a local and USB drive to another USB drive. Others back up a USB drive to a network drive. The networked drive is a Western Digital My Cloud. My network environment is that I have a wireless router and a Rogers modem/wireless router. I have set the Rogers modem/wireless router to bridge mode, so it is effectively just a modem, so I will call it a Rogers modem. My wireless router is connected to the modem via the Internet port on the router, as you would expect. My computer is connected to Ethernet port 1 on the wireless router via Ethernet cable. The 4TB Western Digital My Cloud is connected to Ethernet port 3 on the wireless router via Ethernet cable. I have a 3TB Western Digital My Book Essential drive connected to the Western Digital My Cloud via the USB port on the WD My Cloud. This makes the Western Digital My Book Essential appear as a 3TB share named "drive2" on the Western Digital My Cloud. When I back up from USB to USB I don't have any problems. About 6 weeks ago I added the Western Digital drives to my network and moved one of my backups to the 4TB folder and another one of my backups to the 3TB folder. I left the backup setups as is except for the destination folders, which now appear like \\MyCloud\AcronisBackups1\H and \\MyCloud\drive2\AcronisBackups2\E Now when I back up to the networked drives I have a very high Internet usage. For example, when I made a full backup which resulted in a 1.7TB .tib file I had usage of 90GB. When I made a differential back up which resulted in a 30.2GB .tib file (and possibly had to read the 565.3GB full backup) I had Internet usage of 19GB. I am not backing anything up to the Internet, and I have not logged in Acronis TrueImage, so in theory it can't even access my Internet storage. The Internet usage appears to be 5% to 63% of the .tib file size. I do have the feature turned on to send an email confirmation, but that feature is also turned on for the USB to USB backups which don't cause any Internet usage. This usage is problematic, especially for the large backup, since I have a monthly limit of 100GB. Any ideas of what might be causing the usage?

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I have confirmed that the high usage occurs during the time that the backup file is being made, but not when the backup files are being validated. I did a differential backup of a drive that has 1.8TB of data which has an image file of 1.7TB. (This is the same drive and backup set from the previous post.) The new differential file is 1.8GB. The backup took 29 hours. I used task manager to spot check the network usage and was surprised that it was practically 0%. I left my Internet modem attached to the router for two hours, and despite the low network activity (when I looked) I had about 8GB extra download usage. This is in proportion with the 90GB of extra usage I had the last time I backed up this drive (2Hrs/29Hrs*90GB=7.6GB) Even though I disconnected the Internet modem after two hours the backup completed, so it appears that the Internet usage is not necessary for the backup process. Acronis then validated all versions of the backup totaling 3.3TB. Network usage during this phase was 50% of my 1gps Ethernet connection and took 7.5 hours. Since my ISP measures daily usage and the backup and validation took place on different days, I was able to measure the Internet usage for each phase. During the validation I connected the Internet modem for 1 hour, but there was no extra usage at all.

I have found a way to stop the high Internet usage which was occurring during a backup from a USB-attached drive to a network-attached Western Digital My Cloud.

My router has a Parental Controls feature which permits you to block Internet access for specific devices on the local area network. I have set the parental controls to "always" block the Western Digital My Cloud, and now when I back up using Acronis TrueImage 2014 I no longer have high Internet usage.

I wasn't using the "Cloud Access" feature of the Western Digital My Cloud which allows you to access your data from outside your home, and now I probably can't because the WD My Cloud no longer has Internet access.

Following a suggestion from the Western Digital forum, I tested and verified that turning off "Cloud Access" on the My Cloud drive also curtails the high Internet usage when backing up from Acronis TrueImage 2014 to the locally-attached My Cloud drive. This shows that the usage is caused by the Cloud Access feature. I don't know why; and it is curious that althogh the usage happens when writing the backup file to the My Cloud, the My Cloud drive is reading from the Internet.