Does Time Machine back up mounted disk images?

I keep certain sensitive data encrypted on a .sparsebundle file. If this file is mounted when Time Machine kicks in, will Time Machine back up the unencrypted data to my backup disk?
Martin S Taylor

I see. But it's not the sparsebundle I'm worried about: I'm concerned about the contents of the disk being backed up.
From what you say, I'm assuming the contents are never directly backed up whether encrypted or not: if the disk is unmounted, then obviously the contents can't be backed up (only the .sparseimage file itself); and if it's mounted – well, they're just not backed up, because this isn't how Time Machine works.
Have I got this right?
Martin

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