made AWS credentials optional#1

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floriankick wants to merge 4 commits intojareware:masterfrom

floriankick:master

Commits on May 16, 2019

made AWS credentials optional
Florian Kick
committed

Commits on May 22, 2019

updated readme
Florian Kick
committed
fixed cron issue due to pam config on Amazon Linux
Florian Kick
committed

Commits on Aug 21, 2019

delay date replacement in backup filename to avoid overwriting same backup file on every cronjob run
Florian Kick
committed