A:AnswerYou can backup saves to the hard drive. Unplug your hard drive after you’ve backed up and before you reset gaming system. Then...Re-install games..... your backup files will be on hard drive and accessible once you plug it back into your PS4
A:AnswerYes, you can transfer all games that were stored on the internal drive to the external. Also you can move your apps like YouTube, Spotify, Netflix and more over to the ext hdd it’s not exclusive to games.
A:AnswerOnce you connect and follow The directions provided the PS4 will then use the external for apps and media. It will do an initial format when installed.
A:AnswerNo you do not lose the data, because it is stored on the Ext. HDD(external hard disc drive) like the device is designed for. But always be sure to shut down the system before removing/unplugging the Ext. HDD to minimize possible file corruption.