Suggestion: Make it so that the plugin can save and load all alive sleepers their inventory on commands (the commands will need a permission)

That way its really easy to save everyones inventory right before a force wipe, and then load the inventory after the force wipe and this way lower force wipe impact.

Could really use this for my Roleplay server.

Just to clarify - this plugin was created as an API for other plugins to use. Maybe I will extend it's functionality, but not in the meantime.

You can set the backpacks plugin to not wipe when the server wipes, it will not however save main inventory/belt/clothing, and of course you might have set the backpack size(s) (if any) as permissions for time on server or rewards ,
or you could try  https://umod.org/plugins/inventory-guardian
I used it many years ago but it stopped working for a while and i never went back to it , it was last updated a year ago.