Cannot install Yosemite as it keeps telling me both my internal and external drives are time machine backups

Cannot install Yosemite. Keeps telling me that both my internal and external
drives are backing up with TIme Machine. Any suggestions?

Is it actively backing up, or are you encountering a dialog stating that Yosemite cannot be installed because the disk is being used for Time Machine backups?
Read OS X: Cannot install on a volume used by Time Machine for backups
If for some reason you have a folder called Backups.backupdb at the root level of the hard disk on which you want to install Yosemite, move it to the Trash.

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