Trash
The units deleted from the system are placed in trash. It means that they can be restored. A required term of storage should be chosen from the dropdown list in the header of a trash section (30 days by default).

On the list, you can see object name, type, and date and time of deletion. Object types are the following:
avl_unit— unit.storage_user— user.avl_resource— resource.avl_unit_group— unit group.avl_retranslator— retranslator.avl_route— route.
Any object from the list can be restored or deleted from the system completely. To restore/delete multiple objects at once, select them with a mouse click and then click Restore all or Delete all in the header.
Deleted objects are always restored into the root account wialon. If needed, you can transfer them later to the accounts that stay lower in the hierarchy. Moreover, you should take into consideration that restoring objects is, in fact, their re-creation, which means that it requires free slots.