Good deal on the over-provisioning, there are some SSD's that has this built in, by having inaccessible blocks, yet we don't know for sure which has or doesn't have this feature inbuilt. Better to be safe than sorry.
I am assuming I can change this at a later point if I have erred on the side of caution a bit too much?
I am using the Macrium program to clone the drive,and it's working,but seems to be taking a very long time. I had to unplug the drive from the motherboard and plug it in via a USB 2.0 is all I have, so that may be the reason.Anyway,Macrium says that it couln't clone the destination drive at first because it could not lock it down,and that it was in use. Don't know why that happened,but that's why I plugged it in via USB. It is currently cloning- been over two hours now,but that's ok. Will give you an update on the end result!
So what happened with Macrium? It should had been a simple clone.
You highlight the drive you want to clone, then select a drive to clone to, and one by one, from the left, drag & drop the partitions onto the destination. At that point, you'll know if it's going to work or not, because if there's 'too much' data, you'll have to shrink partitions or delete unneeded data, such as junk files, old downloads you'll never use again, run disk cleanup using the System Files clean option & be sure to check Windows Update leftovers or files (you'll have to reboot afterwards & it'll look like you're updating again, this is normal).
The only other option I've used & this was sometime back, was EaseUS Todo Backup, which also offers a clone option in the Free Edition, yet this was 3-4 years back.
Have never tried Clonezilla, because there's so many options to choose from that one wouldn't know which to try. I mean, why not one download each for 32 & 64 bit computers in bold to keep it simple for Home users, and leave the rest for advanced users. It is the way the site is organized (a non-user friendly one) as to why I haven't tried Clonezilla.
As for Macrium, like I stated, I've successfully cloned two different Linux Mint installs, 17.3, and one of the other 17 releases, from HDD to SSD. No problems, though on the first boot afterwards, it took a bit of extra time to configure things, maybe 30 seconds at the most. I tried walking another member through this simple to use app & it took 2-3 weeks to 'figure it out'. It took me only seconds, and had never used it before, as far as cloning goes. One thing that's important, if possible, to remove the drive to be cloned to docking station, enclosure, USB adapter, whatever, and install the drive to be cloned before beginning.
Or if there's space inside the computer for both, which is faster, go that way. You choose Disk Image in the upper right, and then click onto the one you want to clone & there'll be two options, Image this Disk or Clone this Disk, it's as simple as that. One thing that can cause issues during cloning (as well as restoring backups), are messed up file systems. One common error may be 'broken pipe'. Otherwise, as long as the progress bar is moving, don't stop the clone, it takes time to convert, plus setup TRIM for SSD, which adds time to the operation.
So what went wrong with Macrium Reflect? I've been using the brand for backup since 2008 or so, and since 2013 for cloning. The only times I had trouble with clones was with other's computers, wanting to upgrade from a HDD to SSD, and there was either too much data to clone, or the file system was corrupted. A couple of times I was able to finish by using the Full disk check & repair, other times there were way too many bad sectors to complete the operation. Which is the last thing one wants to carry over to a new SSD, corrupted baggage from the old install. That is useless, and will place a heavy burden on the SSD to repair.
Please keep us updated on your progress, I know that somehow, you can pull this off, as long as the current drive is healthy. Plus any cables used for the transfer.