Restore my 3GS as new. Then sync to a backup. Possible?

[cph]

Hi:

I upgraded my 3GS to iOS4 and it's been slow. Someone suggested to set up my phone as new and it will help. True?

If true, then can I sync my 3GS first to create the most recent backup, then restore the phone and set it up as new, and then sync the phone to the latest backup so I can get all my data back on the phone?

Thanks.

 

[ntrigue]

It's the bad data IN the backup causing you issues. However, as long as you name the phone something different than the backup it can be restored from the backup.