To reinforce what others said.
Google drive will NUKE your Library (it changes file names in ways that no longer match what is in the DB)
The others may randomly introduce errors. Those can take a long time to show that they happened.
+1 of freefilesync. It takes longer to determine what changed than do the actual file copy phase. Fast drive recommended on both sides (flash drive are not fast, but will work. Just takes longer)
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