How can i reset my iphone but keep all my stuff backed up?

I have a **** ton of screenshots of memes and stuff on my iphone and it took up almost all the space but i also have alot of family pics and stuff… I want to reset my phone i get my storage back but i don't want to loose it forever yes i know i know you can backup your phone with itunes but if i back up my reset phone it will overwrite the old backup how can i keep a old backup and have a new backup?

Never let yourself have only one copy of anything important. Copy all the stuff you want to keep to a place not related to the phone, like a folder or photo app on the computer. Double check to make sure you can get to any one item. Then you can free up space on the phone all you want.