Time Machine Backup popup comes up even though Time Machine turned off

So, are you saying adding everything to the exclusion list doesn't work?

1. 5.Delete the file /Library/Preferences/com.apple.TimeMachine.plist (in your top-level Library folder, not the Library folder inside your home folder, where most user preferences are).
2. (A Spotlight search won't find it, and neither will a Finder search, unless you include System Files).
3. If you have trouble finding it, from a Finder menubar, select Go > Go to Folder, copy /Library/Preferences to the prompt and click Go. Scroll down until you find com.apple.TimeMachine.plist

http://pondini.org/TM/A4.html

If you have more than one user account, you must be logged in as an administrator to carry out these instructions.

Triple-click anywhere in the line below to select it:

sudo launchctl list | sed 1d | awk '!/0x|com\.(apple|openssh|vix)|org\.(amav|apac|cups|isc|ntp|postf|x)/{print $3}' | open -f -a TextEdit

Copy the selected text to the Clipboard (command-C).

Launch the Terminal application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.

Paste into the Terminal window (command-V). You'll be prompted for your login password. Nothing will be displayed when you type it. If you don’t have a login password, you’ll need to set one before you can run the command. You may get a one-time warning not to screw up. Confirm. You don't need to post the warning.

If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator. Log in as one and start over.

A TextEdit window will open. Post the contents of that window (not the Terminal window), if any — the text, please, not a screenshot. The title of the window doesn't matter, and you don't need to post that.