[7.4] [DOCS] Adds note about backups to Upgrade doc (#50525)#50724

Merged

gchaps merged 1 commit intoelastic:7.4from gchaps:backport/7.4/pr-50525

Nov 14, 2019

+10-2

Commits on Nov 14, 2019

[DOCS] Adds note about backups to Upgrade doc (elastic#50525 )
gchaps
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