The problem with a situation in which you expect your main hard drives to fail this often is that you can't just rely on a backup strategy. By switching to SSD, you're taking on more risk. If BACKUPS are for extreme rare cases, then your backups to your failing SSDs are no longer true BACKUPS -- they've become data that you're likely to use, not just in extreme rare case. So you need BACKUPS to your backups, i.e. you need to have two different backup strategies: two different softwares, two different channels, two different target media/hosts. Otherwise, you've just raised your risk level across the board.