Add logs to cell backup routines.

[vEpiphyte]

No description provided.

[codecov]

Codecov Report

Merging #2060 (374333b) into master (202cf25) will decrease coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2060      +/-   ##
==========================================
- Coverage   96.81%   96.66%   -0.15%     
==========================================
  Files         149      149              
  Lines       29511    29518       +7     
==========================================
- Hits        28570    28535      -35     
- Misses        941      983      +42     

Flag	Coverage Δ
linux	96.66% <100.00%> (-0.15%)	⬇️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/cell.py	98.10% <100.00%> (+0.01%)	⬆️
synapse/tests/utils.py	93.66% <0.00%> (-2.16%)	⬇️
synapse/lib/hiveauth.py	96.05% <0.00%> (-0.76%)	⬇️
synapse/cortex.py	95.91% <0.00%> (-0.73%)	⬇️
synapse/lib/view.py	94.19% <0.00%> (-0.70%)	⬇️
synapse/lib/trigger.py	93.91% <0.00%> (-0.44%)	⬇️
synapse/lib/layer.py	98.06% <0.00%> (-0.07%)	⬇️

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