If the guy who sold it, can't support it, better contact Toshiba or the shop where he bought it originally.
In the Windows world, tib is an Acronis full disk image: http://filext.com/file-extension/tib
And so it seems in the Linux world: http://www.wilderssecurity.com/showthread.php?t=77524
And that's all I can offer you.
May I remark that it doesn't make much sense to me to buy such an old (5 years) device without any support. It might be cheap, but you have to invest so much time to get it working (without any certainty that you will succeed) that - whatever business you are running - you'd better spend that time earning money with your business, buying something you can use off the shelf and still have something left.