added devops section on backups

[invisig0th]

No description provided.

[codecov]

Codecov Report

Merging #1764 into master will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1764      +/-   ##
==========================================
- Coverage   96.13%   96.05%   -0.08%     
==========================================
  Files         139      139              
  Lines       26331    26331              
==========================================
- Hits        25312    25291      -21     
- Misses       1019     1040      +21     

Flag	Coverage Δ
#linux	96.05% <ø> (-0.08%)	⬇️
#linux_replay	66.40% <ø> (+0.02%)	⬆️

Impacted Files	Coverage Δ
synapse/lib/spawn.py	89.03% <0.00%> (-6.46%)	⬇️
synapse/lib/snap.py	94.61% <0.00%> (-0.34%)	⬇️
synapse/common.py	96.41% <0.00%> (-0.33%)	⬇️
synapse/tools/migrate_200.py	97.81% <0.00%> (+0.08%)	⬆️
synapse/daemon.py	88.82% <0.00%> (+0.29%)	⬆️

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