We have Windows 7 Home Premium 64-bit and have used a Western Digital hard drive to back it up for at least two months. For the past week or so, backups fail (Error 0x8007045D), and neither Olaf's chkdsk nor a direct disk check indicate any errors. In addition, when our computer hibernates and we have to log back in, the computer does not detect the WD drive anymore. How can we resolve this? We need to back up our computer!

After checking this issue, I suggest you take the following steps to check it: 1. If it is possible, please back up to a DVD or anther external drive to test this issue. 2. I would like to share a similar thread with you, hopefully it could help you: Backup and Restore - 0x8007045D Error Hope it helps. Alex ZhaoPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.