Add Postgres DB backup and restore support

Registered by Fausto Marzi

As Postgres have WAL files available, it is possible now to execute backups and restore with very little or even without downtime.
The following link show good options to achieve this:

- http://www.postgresql.org/docs/9.3/static/backup-file.html

The snapshot section is particularly easy to add in Freezer

Blueprint information

Status:
Not started
Approver:
Fausto Marzi
Priority:
Low
Drafter:
Fausto Marzi
Direction:
Approved
Assignee:
None
Definition:
Approved
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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