Macrium Backup Fail

Error code 21

cereberus said:

Nice of you to post this. Unfortunately, my mind reading skills are out of practice, so I have no idea why you are posting this - a statement, a plea for hep, and how we could help with this spectacular lack of information.

Well what do I to solve this issue?

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Bree said:

The last time I saw a backup fail with error 21 it turned out to be due to a faulty usb cable for the external HDD I was backing up to. Replaced the cable and never saw the error again.

This is for my NAS HDD

I was having troubles with Macrium Backup not completing I had a 1 button shortcut saved. Using the regular Macrium utility I found it was failing on a partition on the drive and aborting, unfortunately Windows Disk Management would not allow me to create a drive letter for that partition so I could not run file checks. For some days I had to change the backup to exclude that partition in order for Macrium to complete. Today I had right clicked on a drive and Properties, Tools, Optimize and Defragment, then selected Advanced and found all partitions on the hard drive shown and Optimized the hidden drives as well. 1 exception being a partion marked ESP which would not allow changes. Any way optimizing did it allowed all partitions to backup .

Another issue, though I back up to a 4TB drive, I have found I can not restore a bootable system drive from it while booting from a USB In order to restore I must first save the Macrium file to a 2TB SSD I have. Also seems necessary to change the uefi setting in system bios to boot from usb.

However if I only want to copy a saved file from a Macrium backup I can from the 4tb drive as long as I am careful to check mark the "enable access to restricted folders" in bottom left of page having double clicked to open a backup file.

One should also have a good USB 3 cable if using that older style connector as cables developed for USB1 and 2 may not seem to handle the speed.