I've never used Macrium reflect and would never use it for a backup, but you can also try checking the Macrium reflect forum. I think you have a Macrium Reflect problem.
http://forum.macrium.com/Topic5536.aspx
http://forum.macrium.com/Default.aspx
Edit: You can create a USB factory defaut recovery drive and put it in a safe place
https://www.youtube.com/user/AcerAmericaService/videos
You can also use the guide below to create a weekly or daily automatic system image backup and save it to an external HDD.. To restore the system image, I just wipe the drive with diskpart clean and then boot a USB recovery drive to restore the system image in Windows 10.
http://pureinfotech.com/schedule-windows-81-system-image-backup/
If you can't get your Macrium to work, and are tired of messing with it, and you don't have a USB recovery drive, you can get your factory recovery media from Acer Store.