Is storing an encrypted RAR file to an insecure cloud service an admissible way of securing data

Consider the following scenario:
I use a cloud service that is not considered secure (meaning no encryption whatsoever) i.e. Dropbox, OneDrive, Google Drive etc. (It is quite well known that these services scan your files for pedo stuff) In my account I have a .RAR file that is encrypted using a very strong password let's say 22 characters which is quite impossible to brute force yet. For the sake of argument, let's say that I used WinRAR to create this …

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