Cryopreservation

You place biological matter or a creature you touch into magically frozen stasis. An unwilling creature must make a Constitution saving throw. On a failed save, it enters stasis.

While in stasis, the target doesn’t decay, age, or require sustenance, effectively extending the time limit on raising the target from the dead, since days spent under the influence of this spell don't count against the time limit of spells such as raise dead.

Dispel magic or Greater Restoration upcast to level 7 or higher ends the stasis.