I've tried searching, but haven't found a plugin that saves just the inventories of all the players every now and then. This would benefit a lot of servers in the case of a random crash where inventories roll back due to them not being saved. You could just set a simple interval like 5 minutes or so for inventories to be saved. If there is a default setting to save the inventories somewhere in the one of the config files then please could you tell me where it is?