How to backup everything on a old 3DS?

I am getting a New 3DS XL soon and I am planning on transferring my games/data/Homebrew, and I want to make a backup of my whole system in case I screw something up.
I want to backup everything on my old 3DS, which has Homebrew on it.

nintendo-3ds-3dsxl-2ds homebrew

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How do I transfer data from my old 3DS?

Complete these steps

From the HOME Menu tap the System Settings Icon and then Open.

Tap Other Settings.

Tap 3 and then System Transfer.

Tap Transfer from Nintendo 3DS.

Read the information about the transfer and tap Agree.

Tap Send from This System.

Can you back up saves 3DS?

Insert the SD Card with the Nintendo 3DS data into the SD Card Slot or the SD Card reader/writer. Open Windows Explorer (for PC) or Finder (for Mac) and access the SD Card. Highlight the data and drag it to the desktop. If performed as part of a system transfer, drag all folders to the desktop as they appear.

How do I backup my 3DS SD card?

Once the transfer process has completed, all data on the original system is deleted. After performing the transfer, any data on the SD Card of the original system can only be used on the new system, and will not be recognised by the original system.

How to Backup Save Files on a Nintendo 3DS - 16 Bit Guide

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