Maximum amount of firefire devices until i notice speed problems?

I have a newer imac and the WD 4TB raid drive, which i have seen use up about 70 MB/s max with large transfers. Problem is since i partitioned it and run time machine on it, it slows down anything on that drive while its backing up. So i was thinking of getting a 2TB drive for time machine and backups. Along with an M-Audio project mix audio interface when will it start affecting the firewire bandwidth

For Time Machine, speed is not so critical. So I would get a less expensive, but large, USB 2.0 external drive to use as your Time Machine archive drive. USB 2.0 is fast enough for Time Machine. That frees up the FireWire bandwidth currently used by Time Machine for doing backups.
To answer your question, any recent SATA drive is capable of much faster file transfer than even FireWire 800. So the FireWire port is the bottleneck. Therefore, if the drive is being accessed, it will affect the transfer rate of any other drive being accessed at the same time. If the drive is just sitting there not being accessed, it should not affect transfer file to another drive.

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