Hello and welcome to MobileRead!
A word of warning, though: Google Drive is incompatible with the calibre library structure, and unless you zip the library folder up, it may get corrupted on Google Drive. See this post (yes, it's over a decade old, but AFAIK still applies):
https://www.mobileread.com/forums/sh...d.php?t=205581
Personally I use Dropbox for my cloud backup, and FreeFileSync for incremental updating of the backup copy.