Making a Nandroid will allow you to try out new ROMs while still keeping a safe backup in the event you experience issues during or after a custom OS or kernel installation. Be sure your LG Nexus 5 is fully charged before proceeding to the backup and flashing procedures.
If you are not already booted into recovery then do so now.
NOTE: Be sure to save a copy of these backups to your computer and/or micro sd card. Having a recent backup saved to your computer and micro SD card can be useful if something happens to your phones internal memory.
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