PHRAS-3991: pre upgrade backup WIP #645

Job	Run time
build phraseanet-fpm / build	3m 59s
build phraseanet-nginx / build	3m 39s
build phraseanet-db / build	30s
build phraseanet-elasticsearch / build	18s
build phraseanet-setup / build	3m 24s
build phraseanet-worker / build	4m 2s
unit test	10m 8s
	26m 0s

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