After time machine back up

I am using the WD passport for mac, and I need to know if it is safe to delete files from my Macintosh hd once it is on my time machine?

Whoa.
If you delete the files from your Mac.....you only have one version of them on the WD drive.
What will happen when....not if....the WD drive has a problem?
Only the most foolhardy of users would ever consider keeping only one version of their important files.
My advice, if you decide to do this anyway, would be to only delete files from your Mac that you can afford to lose.
Another thought might be that Time Machine backs up the changes on your Mac. When Time Machine starts needing more space, it will pick up the fact that you deleted the original files from your Mac.....and it will delete them from your backups.  You will not know when this will occur.
Bottom line....to be safe, you need at least one version of your important data on two separate drives. When one fails, you at least have the other.

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    Whoa.
    If you delete the files from your Mac.....you only have one version of them on the WD drive.
    What will happen when....not if....the WD drive has a problem?
    Only the most foolhardy of users would ever consider keeping only one version of their important files.
    My advice, if you decide to do this anyway, would be to only delete files from your Mac that you can afford to lose.
    Another thought might be that Time Machine backs up the changes on your Mac. When Time Machine starts needing more space, it will pick up the fact that you deleted the original files from your Mac.....and it will delete them from your backups.  You will not know when this will occur.
    Bottom line....to be safe, you need at least one version of your important data on two separate drives. When one fails, you at least have the other.

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