Windows backup "Volumes larger than" error

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.