Hi Carlitos,
LC29H has Backup mode which keeps power supply for backup domain( RTC & RAM ).
Dual-band module unavoidably have high power consumption. If your product mainly work in low power condition, I suggest you to choose LC76GPA ( low power consumption, single-band, not support I2C ).
Chinese new year is coming, and we will have a one-week holiday from tomorrow. Please forgive the absense for your query. Thanks.
Best regards.