powershell recursive rename with wildcard

I have these backup files:
 And so on....
I want to rename them
how can I go recursively through file directory and rename all of the backups?
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Depends. In the first two examples, you kept the "_backup" part and only removed the dates, in the BDC example, you removed the _backup as well ...

Both of the following are in test mode and will only show which files they would rename how; remove the -WhatIf argument to run them for real:
To keep the "_backup":
Get-ChildItem -Filter *.bak -Recurse |
	Where-Object {$_.BaseName -match '(?<NewName>.*)_\d{4}_\d{2}_\d{2}_\d{6}_\d{7}'} |
	ForEach-Object {Rename-Item -Path $_.FullName -NewName "$($Matches['NewName'])$($_.Extension)" -WhatIf}

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To remove the "_backup" as well:
Get-ChildItem -Filter *.bak -Recurse |
	Where-Object {$_.BaseName -match '(?<NewName>.*)_backup_\d{4}_\d{2}_\d{2}_\d{6}_\d{7}'} |
	ForEach-Object {Rename-Item -Path $_.FullName -NewName "$($Matches['NewName'])$($_.Extension)" -WhatIf}

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Dustin SaundersDirector of OperationsCommented:
Critera = only remove numbers from end?  

What should happen if there are more than 1 file that would rename to the same?
Dustin SaundersDirector of OperationsCommented:
No feedback from Author, but code provided sufficient.
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