Any chance to restore from TM to external usb during normal operation?

The goal is to periodically conduct a test restore from Time Machine to external usb drive.
Main point is that for duration of the restore the Mac must not be blocked just for this operation only but to let the restore run in background while being able to do regular work in foreground.
Basically it should not be a big problem cause the TM data is on network
and restore destination is the external usb drive. OS X is started from internal HD.

Till now I found one single way to do recovery from TM: recovery mode by booting with cmd+R. However it does not meet the requirement of concurrent restore with regular job.
Any chance to achieve the goal?

Weaselboy said:

Nope... you will need to be in recovery some way either fro the recovery partition or an external recovery key of some sort to restore like this, even to another drive.

Click to expand...

Thanks for feedback, this answers the question been asked.
It is a pity! Recovering is a time consuming job.
Mac is not available for regular tasks. Especially painful cause it is
a recovery for a test and neither source
nor destination of restore is locked by os x operation.