Area Storage System
WorldTool uses structure blocks to save areas with the save_area process and load areas with the load_area process.
When used for purposes such as undo/redo and copy/paste, the area data is stored on each indivual player using PlayerDB.
Backup Slots
In order to use structure blocks to save an area, you need structure names. And since strings such as these cannot be generated, I had to make a list of available strings, which I call "backup slots". Backup slots are named worldtool:n, with n being a number from 1 to 1000.
To get a backup slot for use, just get AvailableBackupSlots[0] from the storage worldtool:storage.
To get a certain amount of slots, set the #amount worldtool score to the desired number and run the function worldtool:technical/common/save_load/get_slots. The backup slots will then appear in the Temp.BackupSlots list inside the worldtool:storage storage. Before doing this, make sure to remove Temp.BackupSlots and set the #temp worldtool score to 0.
Once you no longer have any use for a slot, make sure to return it to the AvailableBackupSlots list inside the worldtool:storage storage.