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.
The folder where your backup data is stored depends on your computer's operating system. Make sure the backup folder is included in your data-backup routine. iTunes places the backup files in these places:1  Mac 2  : The 3  .  represents your Home folder. 4  Windows XP: 5  To quickly access the Application Data folder, click Start, and choose Run. 6  Windows Vista, Windows 7, and Windows 8: 7  To quickly access the AppData folder, click Start.ake sure the backup folder is included in your data-backup routine. iTunes places the backup files in these places: 1  Mac 2  : The 3  .  represents your Home folder. 4  If you don't see Library in your Home folder, hold Option and click the Go menu.