Always keep a backup. Even the best new editors occasionally have bugs with the "Bonfire Ascetic" flags. If you corrupt your save, the PS4 will say "The saved data is corrupted." Solution: Keep your original USB backup.
Recently, new save editors have emerged, specifically designed for the PS4 version of Dark Souls 2. These editors, such as the popular "Dark Souls 2 Save Editor" tool, offer a range of features, including: dark souls 2 ps4 save editor new