HT1338 I cannot open encrypted files/folders on my back up disc.

Hi, I created an encrypted disc, with disc utility. It is a .sparseimage type file, 128 encryption, password protected. I can open it on my Mac no problem, I took the password off the keychain (as advised) and if I try to open the disc (which I placed in "Documents") once I enter the password, everything opens fine.
The problem is when I try to open the files on my back up disc (I use an external hard drive to back up everything, via time machine) I get this message after entering the password" The following disc images could not be opened" and in a smaller box underneath, the relevant disc is named and it says this next to it"no mountable file systems".
So if my Mac was to crash and I needed the ext. hd as a back up for recovery, currently, the encrypted files cannot be opened.
Can anyone please help?
Many thanks,
Michael.

How do you copy it to the backup disk? That error generally means that the file didn't fully copy over.
Open a Terminal window. Type 'md5', space, and then drag the sparseimage file that works into the Terminal window, and then press return.
Do the same think for the sparseimage that doesn't work.
If they are the same file, they should have the same MD5 value. If the codes don't match, the files are not identical.
Do a Get Info on each file and see if they are the same length.
The only thing I can think of is that file is not completely copied or the external disk is formatted as a FAT32 (Windows) disk, in which case, files can't be more than 4G and if your image is larger than that, it will get cut off.

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