Resetting my ipad

Frankly, I've never "restored" my phone from a backup-- but I'm counting on it working! Of course, it always has worked when I've bought a new iPhone, so I have a lot of confidence. TheLittles gave you some great hints on dealign with storage.

iCloud Backup doesn't save everything-- for instance, if you use iCloud Photos, then your pictures will be there and not in the Backup. You should go to iCloud.com and make sure you see everything that you think you should.

Do you use "Optimize Storage?" If not, that can save lots of space on the phone. That's really the best space saving service if you have lots of pictures.

I would want to have more backup than iCloud. As TheLittles said, the best deal is to save stuff to a computer and an external hard drive. As for pictures, you can select them and use Share>Save to Files to save them to an external hard drive that's plugged in to the iPad's port.

This pushes iCloud, a lot,

Back up iPhone - Apple Support

but it also tells how to back up the iPad (it says iPhone, but it's the same) to a computer.

Edit...

"Resetting my ipad: My iPad storage is maxed out. I have backed up my iPad to iCloud successfully. I need to do a new iOS update but I don’t have enough space. I’ve deleted everything I possibly can. I’m nervous about doing a restore. Any suggestions?"

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Troubleshooting Internal iPad Storage:

Internal storage cannot be upgraded. It is what it is. So, the maximum internal storage capacity never increases, even if you upgraded your iCloud plan. Learn More here: What's the Difference Between Device Storage and iCloud Storage? Apple Support

So, what to do...

Clear Space Using my User Tips:

• How to Clear Space from your Mobile Device, and What to Clear: - User Tip. You may have too much installed, and need to clear space. So, see my user tip: 
• Rid of "System Data" (Formerly Called "Other"): Just like on an iPhone, backup your iPad to a computer (Mac or PC), and then restore your iPhone from the backup. Use my User Tip: How to Clear "Other" in your iPhone's Storage - Use Backup - User Tip

Export Photos:

Export your Photos to a computer (Mac or Windows PC). Then, remove them from your phone. Transfer them to an external hard drive, and then store the external hard drive for backup and safe keeping (use Drag & Drop to perform the transfer. Use Cut & Paste, or it would remain on your computer).