Performance is often a concern in any medium or large database.
Backup performance is often a delicate issue, because the resource usage may need to be limited to within certain boundaries. There may also be a restriction on the maximum run-time for the backup, for example, if the backup runs each Sunday.
Again, restore performance may be more important than backup performance, even if backup is the more obvious concern.
If performance is a concern or is likely to be one, then you should read the recipe about planning first.