Description
/back
/backhistory [page=1] (1.1.0+)
Whenver you use any of the following commands:
tp, tpto, goto, teleport, spawn, warp, randomwarp, rules, acceptsummon, home, wilderness.
In the server minecraftonline.com (which is currently in version 1.12.2, which plans to upgrade soon)
It will also save your current dimension as either "overworld", "nether", or "end".
/back, it will use the command /tpto coordinates dimension, for example "/tpto 100 65 -100 overworld".
/backhistory [page=1] shows every saved location + date and allows you to click them to automatically write their corresponding /back