Hello Arlis,
Thank you for posting your question on Microsoft community.
I appreciate you for providing details about your query.
It is always better to keep Windows backup undisturbed.
However, if you want to use your computer while creating backup, you may use it for running those processes which may take lesser memory and take lesser processing time.
Those processes may include typing a document, playing music and so on.
You may also refer this article:
Back up and restore: frequently asked questions
http://windows.microsoft.com/en-us/windows/back-up-restore-faq#1TC=windows-7
I hope this information helps.
Please do let us know if you need any further assistance.
Thank you