I used to be a big fan of HP but since a printer I bought several years ago turned out to be a bit of a lemon, I've steared clear of them. I assembled my own PC in 2007 - that way I could get just what I wanted and at a reasonable price (if I didn't count the time I spent putting it together - but that was fun).
Not sure if you can hot-swap aSATA. If it is connected & available on bootup, you can switch it off, then on (or disconnect & re-connect) at a leter time and it is usable.
I am using the eSATA port on my MOBO but I would imagine it would be the same if I used the port on the front panel of my PC.
I'm backing up with Genie - seems to be a great product. It has a few of the usual MS / Windows issues of assuming it knows better than you what you are doing - which is most often incorrect.
I do not do image backups. The reason being that if I have a catastrophic failure, I would most likely need to replace an important component and following a restore (if it even worked) the image B/U may not recognize it. Also, I can restore what I need to another system while I am fixing this one.
To date, I have used my B/Us to recover files that I (or the O/S) have messed up or lost.
Other opinions would be welcome here...
Richard