Posted 25 February 2013 - 03:31
It depends on the operation. If you are merely resizing partitions then it shouldn't be destructive, but it is always a good idea to keep a backup of any critical files you have prior to the operation. I have never had GParted fail and corrupt my data (other than when I foolishly canceled it in the middle of a resize operation), but I have made mistakes (where I told GParted to perform an operation other than what I intended). Never risk your data.