So far, the system has not produced consistently functional cards, and there is no backup mechanism for processing applications.

But, he insisted, "you have to have some sort of backup mechanism in case that fails."

They may have manual backup mechanisms to enable hand-driven respiration in the absence of power (such as the mechanical ventilator integrated into an anaesthetic machine).

The House bill has no such backup mechanism.

Similarly, an organism may be able to cope with a few defects, but the presence of many mutations could overwhelm its backup mechanisms.

The backup self-destruct mechanism was set to a 60 hour timer, so a team was quickly sent out to locate and recover the capsule.

"Something has sealed the breach, but it's not one of the backup mechanisms."

But there must be a backup mechanism.

Large bacteria might starve easily unless they have a different backup mechanism.

The House bill includes no backup mechanism.