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 The Single Instance Storage Filter must be installed or enabled to access the data in the SIS volume.  The backup program must be capable and configured to backup and restore the reparse points or junction points (links) to the files, and the SIS volume and the SIS Common Store folder must be selected.