Give backup user required permissions on mysql

See merge request !6

mysql/postgres: fix warning that when uses raw variables

See merge request !5

Only setup backup when rsnapshot is configured, don't use password for root auth

See merge request !4

Fix spaces

Bullseye Compatibility

See merge request !3

redis-server: Allow configuration

See merge request !1

Both postgres and mysql require the rsnapshot role to run first!

This is also deprecated for 2.7