Re: Backup Backup Backup!!!
Having a 20% failure rate, you either have sourced some pretty bad SSD's or your workloads must be of the quite insane type.
I have no idea what kind of type drives you buy, but for consumer level drives I've found that for the gnarly workloads where TRIM is generally ineffective for one reason or another - overprovisioning your SSD by buying one size bigger and then locking out the extra space from the OS using HPA or just not partitioning all of it for the lazy bums - you'll get significantly better lifetime and long-term write performance. This in effect gives the SSD much more spare area to organize its writes in a flash friendly way, resulting in significant reduction of write amplification - in order of magnitude in some cases.
This little trick can give you quite close to "enterprise grade" write endurance at consumer price points. A typical consumer drive have 0-7% spare configured at the factory, pushing this up to around ~20% or maybe even 25% helps a lot. Intel had a paper on this, but I cant find it right now..
If you want to do this on already used drives, keep in mind you'll have to TRIM the entire drive or "secure erase" it before doing this, or else the sectors will generally not be considered free and this entire exercise rendered futile.
Or you could just let the vendor do it for you and charge you 10x the price (for that and a few other features that may or may not be important to you)