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on your screen, you’re looking at the "stock" recovery that came with your phone. It’s great for basic factory resets, but it won't let you flash custom ROMs or perform full system backups. To do that, you need a custom recovery like TWRP (Team Win Recovery Project)

as some newer encryption methods make TWRP tricky to install. The first thing you should do in TWRP is a Nandroid Backup

: On your phone, go to Settings > About Phone and tap Build Number seven times to enable Developer Options. Inside those options, enable USB Debugging and, if available, OEM Unlocking . Step-by-Step Installation Guide (PC Method)

: Most modern and legacy devices require an unlocked bootloader before any custom recovery can be flashed. Enable Developer Options

is the stock recovery environment that shipped with many Android devices running older versions (typically Android 2.3 Gingerbread through Android 4.4 KitKat). The "3e" denotes a version that includes basic signature verification.