When, if ever will blu ray drives become standard.

[Alby_da_Wolf]

^^
Sure, with time, but right now you can already have a 25GB BD-R for less than 10€ including sales tax in EU and in US for even less, $7 or less sales tax excluded, and prices are going down. Solid state non volatile memories are great for speed, but for medium sized home backups BD is becoming cheap, burners are still quite expensive and slow, but next year they'll be under $100, and in two years they'll be cheap, and blank discs will be cheap too. Even if 50GB SSD drives will get very soon cheaper than a BD drive, they won't be cheaper than BD discs, at least not in the near future: if the industry invests in them as changeable media, they'll surely get cheap enough for that purpose, but it will take more years than it will take to BD to become commodity. As I wrote before, anyway, Flash is already a rewritable commodity media, still more expensive than DVD+-RW discs, but so much more fast and practical, by now +-RW optical media are good almost only for living room players and recorders, and this already applies to DVD, not only to BD. As you wrote, you get 128GB SSD for $2000 now, even at a faster than Moore's law price drop it will take at least 5 years to it to drop under $30 and then, for a 64GB drive, maybe to drop to $10, but in 5 years a 50GB BD-R disc would be under $1 and the drive under $30 and you only have to buy it once, so for permanent copies it would be an obvious choice, although small SSD by then would be already commodities and the obvious choice for a lot of other uses.