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.
Some people like to use discs as a way to back up their files, but you can still store copies of your data even without an optical disc drive. Online backup services provide a way to backup your files online, and offline backup tools can be used to save your files to a flash drive, another computer on your network, or an external hard drive.