Backing Up Unencrypted Vaults

Hi, I am using Blue_Sky’s method for my backup source file in Acronis and I get the error “Failed to back up file or folder xxx. It may be blocked by another application.” as I have described in this separate case Using a CM decrypted folder as backup source for Acronis gives access blocked error
Anyone else gets similar errors with Acronis or any other backup tool?
Any suggestions? Thanks!