Can I backup my external hard drive on another external hard drive?

Hello,
I have a 1tb external hard drive where I keep documents and programs but I also keep my time machine back up on there.
I also have a mini 64gb sd card where I keep my iTunes library.
I want to buy a 2tb hard drive so I can have a backup of
.My built in SSD
.All the data on my 1tb drive
.All the data on my 64gb card.
In essence, I want a back up of my back up (So I have every document in 3 places)

Welcome to Apple Support Communities
If you are using your 1 TB external drive to make Time Machine backups, I do not recommend you to back it up too or it will be a complete mess. Instead, what you can do is to add the 2 TB external drive as another Time Machine backup (you can do it in System Preferences -> Time Machine -> Select Disk).
However, you can make a backup of  your internal hard drive in the 2 TB external drive by following the steps above too, as well as your 64 GB card (you only have to remove it from the "Excluded Items" list).
Another option you have is to use a different backup application to make backups on your 2 TB external drive, so you do not have to do anything with Time Machine. There are apps like Carbon Copy Cloner or SuperDuper you can use for this purpose.

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