How Smoke Alarms Work. Smoke alarms, which are also called smoke detectors, work by constantly checking the air for traces of the gasses and smoke particles produced by a fire. There are two types of smoke alarms-ionization alarms and photoelectric alarms.moke alarms, which are also called smoke detectors, work by constantly checking the air for traces of the gasses and smoke particles produced by a fire.
Exporting items from OST to PST is the best way to create backup of OST file. If you are connected with Exchange server, you can easily do this via manual method. In other case, you should try some third party tool.
1 In the Registry Editor, select the Error 4320-related key (eg. 2  IncrediMail) you want to back up. 3  From the File menu, choose Export. 4  In the Save In list, select the folder where you want to save the IncrediMail backup key. 5  In the File Name box, type a name for your backup file, such as IncrediMail Backup. In the Save In list, select the folder where you want to save the IncrediMail backup key. 2  In the File Name box, type a name for your backup file, such as IncrediMail Backup. 3  In the Export Range box, be sure that  Selected branch  is selected.