not at all. I did this once with my node. Before that it was on Windows and on NTFS, and I migrated data in place thanks to LVM without a damage.
However, my hardware has issues under Linux, so I migrated back (and lost some data because of random kernel panics…).
So, kernel panics will damage your NTFS data under Linux.
If you do not have hardware problems - it’s pretty safe.
The funny thing, that this hardware is working rock solid under Windows… If you do not upgrade to the latest Windows right away, but after 6-7 months. (or better - never… it’s too old).
If you interested, you can read the whole store here: