1 British informal Eccentric or strange.
2 North American Bad-tempered; irritable.
3 (of a machine) working erratically.
Late 18th century (in the sense ‘sickly, in poor health’): perhaps from obsolete (counterfeit) crank ‘a rogue feigning sickness’, from Dutch or German krank ‘sick’.
Relax. There is no need to be cranky about it, You have a recent backup, right?