Is remote backup & local restore between 1.1.0 and 1.2.0 versions possible? Is it more time/space efficient than export/import?

I have influxdb v1.1.0 running on older server and a new server with influxdb v1.20.
I want to copy some (not all) databases from the old server to the new one as described in"Remote Backups" section of documentation ([InfluxDB v1.2 Backup and Restore Docs]
(Back up and restore data in InfluxDB v1.8 | InfluxDB OSS v1 Documentation)) with a sequence of “influxd backup” and “influxd restore” commands on the new server.

$ influxd backup -database myremotedb -host /tmp/backup

$ influxd restore -metadir /var/lib/influxdb/meta /tmp/backup

$ influxd restore -database myremotedb -datadir /var/lib/influxdb/data /tmp/backup

My questions:

  1. Is this remote backup supported between 1.1 and 1.2 versions?
  2. My old server has limited free disk space. Will remote backup need temporary disk space on the old server?
  3. Is there a chance to corrupt databases already present on the new server when myremotedb is restored from backup? (All databases (local and remote) have unique names).
  4. What backup/restore time to expect for ~20-30GB database?