Hey Beepster, you can do it's simple.
I have been recording live gigs with circa 2004 laptops for a few years now and it works fine. The ONLY thing we need the horse power for is VST's. So just stick to audio and you can be recording anywhere you wish with any laptop.
Instead of messing with a backing tracks it would be just as simple to copy the entire CWP file.
The beauty of all this is you also get a killer back up system for your tunes.
I make folders for overall projects like a live band session or say originals. In that folder is everything to do with that set of songs. I make a folder for each song in that folder and in there is the CWP and the audio folder. This is the bullet proof way to do it. There will also be MP3 versions of cover songs or rough ideas, Lyrics etc.
So all ya gotta do is copy to a external storage device ( back up #1) and then to the second computer ( backup #2 )
Make sure to date the containment folder to keep track.
" Originals Jan-16-12"
To record on the Laptop bypass all efxs ( Ctrl Y )
If a lot of synths are involved bounce to tracks and create audio versions which will reduce CPU load, You can probably run TTs-1 on that laptop.
I have recorded 12 tracks of audio and MIDI in one pass on a 1.4 Celeron 1.5 Gigs of RAM.. I will say that I always have used a 7200 RPM HD which is the most important spec for streaming. CPU and Memory are not involved much with audio.
Sing your heart out , SAVE and transfer back to external, and back to original computer. Either overwrite or re name ( Laptop Jan 16 -21 )
One thing is best if you use the same interface so Sonar does not re assign inputs and outs, But not a biggy if so.
Another thing is screen resolution. If your first computer has a higher resolution the file might open with edges off screen so might have to re size before saving.
I just got a Tascam DR 40 for my birthday and it is an option too. The DR 40 is the only one that has both 4 track and XLR inputs for $160. The others all have mini jacks at this price point and most are only 2 track.
I have never had to change the default settings in Sonar other than set up my Audio device and MIDI. I have never changed buffers what ever those are. I just By Pass the EFX bins and go at it. THat Laptop with W& is much better than anything I have used so I don't see a issue, Just check it out with DPCLat meter first.