You're completely mixed up. Factory resetting from bootloader will corrupt his sd card. You only ever factory reset in recovery. Never, ever factory reset in bootloader. He never said he had problems accessing recovery, he said he needs a backup t...
Do the following:
Turn your HTC On.
Holdbfhe power for 15-20 seconds.
Release, when the device flashes.
Press and hold the volume down button.
Press the power button for 3 seconds, and release.
Keep your finger on the volume down button....