Sounds like it's trying to copy the entire drive rather than just the used space or you are using more than the capacity of the SSD on the current drive. I've had issues cloning HDD to SSD before with tools like that and with sector alignment being a consideration didn't use clonezilla like I would if it were HDD to HDD.
What OS is it? Did the OS come pre-installed? I imagine you have a SLIC activation which is easy to reactivate after a clean install.
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