You can have 10 backup characters uploaded to the cloud. To create a backup character you need a tribemate. Go to the obelisk and select travel to another server. It must be a server where you don't have a character or it won't work. When you see the spawn screen press start and go to main menu. On XBOX you have to hit the guide button twice to make the menu pop up.
Now you have your character uploaded to the cloud. If you go to your original server now you get the option to download your character or make a new one. Make a new one and have your tribemate invite you to the tribe.
Now if you die you can just spawn with your other character at a bed like normal mode.
If you don't have a tribemate you can use a second device and an alt account.
This way you can work around the hardcore mode loosing everything when you die.
We did this on official hardcore pvp on xbox and reached endgame, tamed titans etc. We were actually close to do the hard tek cave until we got burned out. We quit because of the time consuming breeding mechanic, short decay timers in pvp and a decreasing playerbase.
A few months later and I'm back on PC starting from scratch. I don't have a second PC and finding tribemates is hard because the hardcore playerbase on PC is small, too.
Pro tip: To level up a fresh character to level 100 in one session you just need a lightning wyvern with decent melee and stam. Find a titan, make it very bloody, collect a tek explorer note (there are 3 on every official map, 4x XP), grab a normal explorer note and finish the titan with a decent compound bow. If you do this with all 3 tek notes on a x2 weekend you get to level 100 in 1-2 hours.
Tl;dr Play hardcore, tell wildcard to look at decay timers on pvp