Hardware Ask: replacing ps4 hdd, backup/restore

[Ethan2]

Hi there,
I just want to upgrade my PS4 hdd to 2TB... But before upgrading I want to be sure if I change my hdd I loss everything that I bought on psn ???
I mean I have many digital games on my account... Yes I know I own these games.. But my question is I have to redownload that games after upgrading ????
What back ups do for me ??? If I full backup my system. After upgrading my hdd can I restore games ???? Without redownloading????