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Hi @Lm6, I am sorry to hear about this.
Your question has been translated to English as this is an international support forum, please post any replies in English and it will be easier for me and other users to assist you.
If you have forgotten the password for the backup you have made in Xperia Companion, I am afraid that the backup will be unusable since there is no way to retrieve the password.
I am sorry for any inconvenience this might cause, Please get back to me if I have misinterpreted your question in any way.