It is important that you clean up your disk storage before you
back up your data and eventually perform your upgrade. Understand why you
should clean up your disk storage.
Cleaning up your disk storage is important for several reasons:
It shortens the amount of time it takes you to back up your data.
It might improve performance.
It frees up additional storage space.
If it is necessary to perform an unplanned recovery from media, your recovery
time is shorter.