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 Hot or On-line Backups-If the database is available and in ARCHIVELOG mode, set the tablespaces into backup mode and backup their files. 2  Also remember to backup the control files and archived redo log files. 3  RMAN Backups-while the database is off-line or on-line, use the rman utility to backup the database.