if you have sufficient LR, it wont be a big issue because ur biofilter is still in the tank operating.
in terms of air, u can get battery operated air pumps for the duration.
most of the time power isnt down long enough where i live to do any damage.
one HUGE factor tho is making sure you have a foot valve on ur return line to prevent a siphon overflowing ur sump. THAT would be a drag!