I want to encrypt data using disk image - will the encryption be retained when the data is backed up by Time Machine?

I want to use the Disk Image utility to create secure, encrypted information storage on my Mac.  I am using Time Capsule with Time Machine to back up my hard drive.  Will the file still be encrypted on Time Capsule?  I am concerned that if someone had access to Time Capsule they could get the data that I want to protect.

If you're not already, you should consider using a sparse bundle disk image as it is more compatible with Time Machine.
With a regular disk image, the image is a single file. If you make changes to the internal files, the entire image will have to be backed up. With a sparse bundle, the image is split into lots of small files. That way, only the small part that contained the changes will need to be backed up.
If the image is small, it doesn't matter much, but if the image is 50GB, you don't want to waste 50GB Of backup space for a 5KB change.

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