Back up failed, and continuing to fail

Hello,

We have a weekly backup running, however it failed to backup last week. Troubleshooting I made sure there was enough space for the download, then tried a manual backup. It has been backing up for 48 hours now and it continues to give us the same error message. If I press "Ignore all" it continues for a little, then gives the same error. Below is the error we receive.

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Failed to read the snapshot.
Additional info:
--------------------
Error code: 50266
Module: 16
LineInfo: 14181c22ef45ada0
Fields: $module : disk_bundle_vs
Message: Failed to read the snapshot.
--------------------
Error code: 9
Module: 0
LineInfo: 2aacb7b2ab852ac
Fields: code : 21, $module : disk_bundle_vs
Message: Unknown status.
--------------------
Error code: 65520
Module: 0
LineInfo: bd28fdbd64edb8e0
Fields: code : 2147942421, $module : disk_bundle_vs
Message: The device is not ready

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Any help will be appreciated