It's not necessarily bad, but it's not recommended if you're moving your gamertag a lot. Over time it's possible it can corrupt your profile and you won't be able to use it. Saving it to a flash drive is also faster and easier.
Did this solve your problem?
Sorry this didn't help.
Great! Thanks for marking this as the answer.
How satisfied are you with this reply?
Thanks for your feedback, it helps us improve the site.