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A week ago I started getting the Windows Backup error 0x807800B4, stating "Volumes larger than 2088958 megabytes cannot be protected." I'm not sure what this is referring to. My system volume is a 256gb SSD and the drive all my data is on is a 3TB hard disk. The consumed space is only a couple hundred gigabytes.

I'm backing up over the network to a 6tb SMB volume. I've been running Windows Backup on this machine successfully for a couple months and this started happening with no hardware change. Any help would be appreciated.

Windows Backup screenshot

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I was suffering from that same (or at least a similar) issue. While reading up on the issue, I read a lot of reports about this issue.

There are 2 possible issues here.

  1. Volumes larger than 2TB can not be backed up.
  2. You can not backup from or to volumes the use sectors larger than 512B

To solve 1, you can tell Windows Backup to not back up the entire volume, but only selected folders from the drive.

To my understanding, there is no solution to proper problem 2. We ended up purchasing new 2TB drives for our backup issue and I've read of several reports where people ended up doing the same.
And, yes, this also applies when the backup target is accessed through SMB.

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Apparently at some point it decided my 3TB volume was a drive that needed to have a system image generated. Had to go through the custom settings to find it. – Andrew Koester Jul 13 '12 at 23:22

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