Some aircraft, the Panavia Tornado for example, retain a very basic hydro-mechanical backup system for limited flight control capability on losing electrical power, in the case of the Tornado this allows rudimentary control of the stabilators only for pitch and roll axis movements.

Some divers instead connect their backup regulator to a smaller " pony cylinder " for extra safety, and there are also emergency systems which mount a simple regulator directly to the top of a small cylinder.

Some also have wireless backup connections, for example via satellite.

Some devices were marketed which allowed a personal computer to use a VHS recorder as a data backup device.

Some backup programs only back up user files ; boot information and files locked by the operating system, such as those in use at the time of the backup, may not be saved on some operating systems.

Some in the software industry question whether the BXA's EAR has specific requirements for backup keys.

Some systems are also equipped with compressed-gas tanks, air compressors, and / or backup batteries to provide ventilation in case of power failure or defective gas supplies, and methods to operate or call for help if their mechanisms or software fail.

Some of them also wanted to restore the German monarchy, as a backup to stop one man gaining so much power in Germany again,

Some argue that Howard should get some credit for the eventual success at Gettysburg because he wisely stationed one of his divisions ( Maj. Gen. Adolph von Steinwehr ) on Cemetery Hill as a reserve and critical backup defensive line.

Some drum groups do not allow females to sit down at their drum but welcome them to stand behind the drummers and sing backup harmonies ; the reasons for this point vaguely to a variety of tribal stories that attempt to tell the history of drumming as each group understands it.

Some backup software looks at the date of the file and compares it with the last backup to determine whether the file was changed.

; Hot database backup: Some database management systems offer a means to generate a backup image of the database while it is online and usable (" hot ").

Some monitoring services also allow collection of historical meta-data, that can be used for Storage Resource Management purposes like projection of data growth, locating redundant primary storage capacity and reclaimable backup capacity.

Some ACOG models incorporate rudimentary ghost ring iron sights as a backup for targets that are within.

Some GC-MS are connected to an NMR spectrometer which acts as a backup detector.

Some GC-MS-NMR are connected to an infrared spectrophotometer which acts as a backup detector.

Some games companies, such as Nintendo, print warnings inside their game manuals that they do not allow users to make backup or archival copies.

Some of these jobs included Visionaries, a comic book based on a 1980s toy line, books in New Universe line, and backup stories in Captain America.

Some TI-81 units omit the backup battery ; if the AAA batteries of one of these units are changed one at a time and quickly, the memory contents are still retained.

Some uses include: absorbency for daily vaginal discharge, light menstrual flow, tampon and menstrual cup backup, spotting, post-intercourse discharge and urinary incontinence.

Some weapons systems have become obsolescent while still in production, and some while still under development.

Some phonetic features, for example glottal catch or murmur, are sometimes to be assigned to segmental phonemics and sometimes to accentual systems.

Some school systems provide written instructions to principals and teachers designating when certain information is to be recorded on cumulative record forms and explaining how the information is to be summarized and used.

Some US School districts and systems return to school in August.

Some belief systems, such as those in the Abrahamic tradition, hold that the dead go to a specific plane of existence after death, as determined by a god, gods, or other divine judgment, based on their actions or beliefs during life.

Some, like Hernando De Soto, argue that much of the poverty in the Third World countries is caused by the lack of Western systems of laws and well-defined and universally recognized property rights.

Some home sewage treatment systems use biological treatment, usually beds of plants and aquaria, that absorb nutrients and bacteria and convert greywater and sewage to clear water.

Some systems are vacuum-insulated, acting something like large thermos bottles.

Some proven intensive, low-effort food-production systems include urban gardening ( indoors and outdoors ).

Some systems used a CD-ROM drive to make the files available.

Some bicycle parts, particularly hub-based gearing systems, are complex, and many cyclists prefer to leave maintenance and repairs to professional bicycle mechanics.

Some systems have proposed as many as 90 subspecies, while recent DNA analysis has identified as few as five clades.

Some modern editing systems can use OCR techniques to read BITC in situations where other forms of timecode are not available.

Some linguists, such as John DeFrancis and J. Marshall Unger have argued that genuine ideographic writing systems with the same capacities as natural languages do not exist.

Some writing systems of the world, notably the Arabic and Hebrew scripts, and derived systems such as the Urdu, Persian, Yiddish, Jawi, and Ladino scripts, are written in a form known as right-to-left ( RTL ), in which writing begins at the right-hand side of a page and concludes at the left-hand side.

Some systems used both codes and ciphers in one system, using superencipherment to increase the security.

Some take the approach of looking for coherent justifications of established copyright systems, while others start with general ethical theories, such as utilitarianism and try to analyse policy through that lens.

Some critics of this approach feel that while these models approach biological reality as a representation of how the system works, they lack explanatory powers because complicated systems of connections with even simple rules are extremely complex and often less interpretable than the system they model.

Some jurisdictions give priority to motorized traffic, for example setting up one-way street systems, free-right turns, high capacity roundabouts, and slip roads.

Some masters use different systems, or even no system at all.

Some light rail systems may run on a narrower gauge.

Some missiles can be fitted with any of a variety of navigation systems ( Inertial navigation, TERCOM, or satellite navigation ).

Some GC systems allow such other resources to be associated with a region of memory that, when collected, causes the other resource to be reclaimed ; this is called finalization.

Some, like VirtualBox and VMware Player run on Windows and Linux hosts and can run many other operating systems.