It was not possible to perform encrypted backups since version 1.4.0b5. An error
message "NotImplementedError("Use module Crypto.Cipher.PKCS1_OAEP instead“)" was
displayed in the log when trying to create such a backup.
Workaround: Disable encrypted backups and perform unencrypted ones.
Encrypted backups created with previous versions need to be restored with 1.4.0b4
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