Backup will not verify

Good day,

I have been attempting to backup my 4.2.4 QubesOS installation so that I can restore my backup to a 4.3 installation, but my backups have failed to validate. Whenever I try to validate a backup, I get the following error:

failed to decrypt (file path)/root.img.003.enc: b'scrypt: Input is not valid scrypt-encrypted block \n'

I am creating a backup on a drive that is connected to my machine through a sata cable. I have tried both compressed and uncompressed backups, both fail to validate. I tried validating an older backup I had and it did validate, so the validation itself works I assume.

I also took a look around at other similar issues, but none of them quite matched mine and they had solutions that did not work for me.

My best guesses regarding this issue is that:
A: I have too many qubes vms.
B: Encrypted backups are broken right now for some reason.
C: One or more qubes are causing the backup or validation to fail for some reason.

I am going to try backing up all the qubes that will not be included with a fresh Qubes installation, and then I will go from there. Maybe I will also try an unencrypted backup.

I would appreciate any advice. Thank you!

Device Specs:
CPU: Intel 12900K
GPU: 6800 xt

To test A and C, try to just backup one small qube.

I thought about that, I will have to test that after I finish my current test.
Thank you for the suggestion! @parulin