Create an online physical backup tool (similar to xtrabackup)

[jonahcohen]

From @yoshinorim:

We need an online physical backup tool, similar to xtrabackup in InnoDB. It should meet at least following features/conditions.

Streaming backup (copying directly to remote host, since local host may not have enough space for backups)
Can take consistent binlog position or GTID (so that we can create slave instances easily)
Backup can finish within reasonable time (close to disk read & transfer & write time of the target data volume, and applying logs)
Not too much write performance drops while taking backups
Not too much read performance drops while taking backups
Nice to have:

Incremental backup
Partial backups (per CF)