A portable drug administration device with a replaceable drug cartridge and a replaceable power cell, comprising - a pump, - a controller configured to control operation of the pump according to a standard administration mode and a special operation mode which differs from the standard administration mode, the standard operation mode including the administration of drug boli according to a bolus administration profile and according to a superimposed basal administration profile, the special operation mode including temporarily suspending drug administration, characterized in that - the controller is configured - to detect the occurrence of an event trigger, the event trigger being generated by the controller upon occurrence of the beginning of a maintenance action by a device user, the maintenance action being the replacement of the power cell, when being exhausted, or of the drug cartridge, when being empty, - to store, in response to the event trigger, administration data, the administration data comprising all information characterizing a current administration according to both bolus administration profiles and basal administration profiles at a time of occurrence of the event trigger, automatically in a memory, - and to switch the device from the standard administration mode to the special operation mode, and - the controller is further configured to detect the occurrence of a restoring trigger, the restoring trigger being generated upon completion of the maintenance action, and to retrieve, in response to the restoring trigger, the administration data from the memory, and to switch the device from the special operation mode to the standard administration mode and to control the pump to resume administration according to the retrieved administration data. - a pump, - a controller configured to control operation of the pump according to a standard administration mode and a special operation mode which differs from the standard administration mode, the standard operation mode including the administration of drug boli according to a bolus administration profile and according to a superimposed basal administration profile, the special operation mode including temporarily suspending drug administration, characterized in that - the controller is configured - to detect the occurrence of an event trigger, the event trigger being generated by the controller upon occurrence of the beginning of a maintenance action by a device user, the maintenance action being the replacement of the power cell, when being exhausted, or of the drug cartridge, when being empty, - to store, in response to the event trigger, administration data, the administration data comprising all information characterizing a current administration according to both bolus administration profiles and basal administration profiles at a time of occurrence of the event trigger, automatically in a memory, - and to switch the device from the standard administration mode to the special operation mode, and - the controller is further configured to detect the occurrence of a restoring trigger, the restoring trigger being generated upon completion of the maintenance action, and to retrieve, in response to the restoring trigger, the administration data from the memory, and to switch the device from the special operation mode to the standard administration mode and to control the pump to resume administration according to the retrieved administration data. - to detect the occurrence of an event trigger, the event trigger being generated by the controller upon occurrence of the beginning of a maintenance action by a device user, the maintenance action being the replacement of the power cell, when being exhausted, or of the drug cartridge, when being empty, - to store, in response to the event trigger, administration data, the administration data comprising all information characterizing a current administration according to both bolus administration profiles and basal administration profiles at a time of occurrence of the event trigger, automatically in a memory, - and to switch the device from the standard administration mode to the special operation mode, and - the controller is further configured to detect the occurrence of a restoring trigger, the restoring trigger being generated upon completion of the maintenance action, and to retrieve, in response to the restoring trigger, the administration data from the memory, and to switch the device from the special operation mode to the standard administration mode and to control the pump to resume administration according to the retrieved administration data.