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On the ESP82xx the RTC memory is addressable per 32 bit.
In total, there is 768 bytes (192 addressable blocks).
0 .. 63 (256 bytes) Reserved for esp8266/Arduino library.
64 .. 73 (40 bytes) RTCStruct.
74 .. 121 (200 bytes) UserVar - Task variables of 12 tasks
122 .. 123 UserVar checksum: RTC_BASE_USERVAR + (sizeof(UserVar) / 4)
128 .. 131 (16 bytes) Cache Controller (C016) meta data
132 .. 191 (240 bytes) Cache Controller (C016) data 6 blocks per sample => max 10 samples
RTC Struct