What If My Computer Sleeps While It Is Running?
The work pauses and continues when the machine wakes. Nothing is corrupted by a sleep.
Sleeping suspends the work rather than breaking it. When the machine wakes, it carries on. A photo is written completely or not at all, so a sleep in the middle cannot leave a damaged file.
An external drive is the exception worth knowing about. If the drive spins down or is disconnected, the run stops with an error and you restart it once the drive is back.
Takeout JSON Metadata Fixer reports anything it could not finish rather than failing silently, so you always know whether to run it again. It runs on your own computer and is free for your first 500 photos.