I have a mid-range samsung device and you know the problem with mid range android devices are storage and speed.
Yesterday there was only 865mb left out of 4gb and there were things in my phone which was taking space (as shown from settings->storage->apps) but when i go to that location from my files it is empty.
The biggest problem is that i cannot transfer apps to my sd card.
So i thought to unistall updates from unsed inbuilt apps and it slowed my phone more.
So i am thinking to resetting my phone.
Please do tell me how to make a phone no. Backup.
Read more: I am thinking to factory reset my phone.what should i do?