Add some minor docs on db backups

Author: ranguard

docs/Backups.md

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+# Backups
+
+## Postgres
+
+We use https://app.snapshooter.com/ (recommended by Digial Ocean) to run our nightly database backup.
+
+This is a full single backup of all databases with 14 days retention.
+
+We store the backups in https://secure.backblaze.com/ (as it's cheeper than snapshooter's storage!)
+
+Credentails for both are in metacpan credentials
+
+