The

{}^{70}{Ni}

nucleus has been produced at the LISOL facility and its

β

decay to

{}^{70}{Cu}

has been observed. In parallel, the

{}^{70}{Cu}

nucleus has been produced at the ISOLDE facility. A new third

β

-decaying isomeric state in

{}^{70}{Cu}

has been identified, partly with the aid of the in-source laser spectroscopy method. Its measured half-life is

T_{1 ∕ 2} = 33 (2) s

. In addition, two isomeric transitions in

{}^{70}{Cu}

have been observed at energies of 101.1(3) and

141.3 (3) keV

, and it allowed the relative placement of the three

{}^{70}{Cu}

isomeric states and their tentative spin and parity assignments. The new

{}^{70}{Cu}

isomer was found to be weakly populated in the

β

decay of

{}^{70}{Ni}

. It allowed the construction of the

{}^{70}{Ni}

decay scheme. Furthermore, the

β

decay of the three

{}^{70}{Cu}

isomers to

{}^{70}{Zn}

has been measured and their decay schemes are presented. The

{}^{70}{Ni}

β

decay to the isomeric states in

{}^{70}{Cu}

and their subsequent isomeric decay and

β

decay to

{}^{70}{Zn}

are discussed within the extreme shell-model picture of two valence nucleons outside the semidouble magic

{}_{28}^{68}{Ni}_{40}

core and it yields satisfactory results. Large-basis shell-model calculations using

{}_{28}^{56}{Ni}_{28}

as the core and a realistic effective interaction support rather well the suggested interpretation.

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