Is Google Drive safe as backup and sync?

Is it safe to maintain a library on a Google Drive if the drive is only used for backup and/or when fully sync'd across endpoints?

The plan is to only work on calibre on a single endpoint at a time (Win10 PC), and only on multiple endpoints (non-concurrently) if the library is fully sync'd first with the on-line copy and any other endpoints. A sort of manual file-locking protocol.

I've seen previous posts that warn of corruption but want to confirm this only happens if the library is modified concurrently from multiple endpoints.

Thanks :)