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disk containing the sole copy of data which you'd "hate to loose".
Backup this data now.

Any rearrangement of a disk bears an inherent risk of thrashing the
disk. A backup is easy to make with Fedora (e.g. using deja-dup), will
reduce your stress level during the operation and making your first
backup may get you into a good habit ;).

Besides, I agree with your conclusion, that Clonezilla may be the best
way for you. I used it and I like it.

Pawe=C5=82