Add intial backup instructions

Backups.md

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+Running your own server is cool, but having backups is a must in that case.
+
+Here is how to do it for the EteSync server, but the procedure depends on your storage backend
+
+## SQLite3 (with the default name given by EteSync)
+
+`sqlite3 /path/to/etesync/db.sq3 ".backup '/path/to/backups/backup_db.sq3'`
+
+If you want more info https://stackoverflow.com/questions/25675314/how-to-backup-sqlite-database or check the SQLite3 documentation
+
+## PostgreSQL
+Basically just dump your database using pg_dump (here we assume the database is called etesync)
+
+`pg_dump etesync > /path/to/backups/etesync.dump`
+
+If you want more info https://www.postgresql.org/docs/current/backup.html