The primary risk of not choosing a strong, secure password for your cloud service is that unscrupulous hackers might gain access to your data. A weak password can be easily guessed or cracked, leading to unauthorized access to your files, personal information, or sensitive data. This could result in data theft, data breaches, identity fraud, and potential loss of privacy.
While the other options mentioned (inaccessibility, improper backup, and accidental deletion of data) are concerns in their own right, they are not directly related to the strength of a password. A strong, secure password is crucial for protecting against external threats and ensuring the safety of your data in the cloud.