Thus, it would be an upset thing.
How to Fix Google Backup and Sync Not Working?
This section will list 10 effective ways.

Way 1.
Now, here is the tutorial.
If this solution does not take effect, try other solutions.
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Way 2.
After that, Google Backup and Sync service will be stopped.
Next, you’re free to hit the desktop shortcut of Google Backup and Sync to restart it.

Disabling or removing OneDrive in Windows 10 would be an easy job.
This post will tell you how to disable or remove OneDrive with a few steps.
Way 3.
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When all steps are finished, check whether the error Google sync and backup not working is solved.
Way 4.
So, to make it fix this error, you better choose the correct account.

Way 5.
This article shows the detailed fix steps when we meet the problem OneDrive sync pending.
If you’re still troubled by this problem, read and learn now.

Way 6.
Sychronize Folder prefs
The Backup and Sync from Google comes with the sync feature.
It allows you to sync individual files.
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If this solution does not take effect, try other solutions.
Way 7.
Check Firewall configs
The Firewall is a Windows built-in feature.

It can provide protection for your gear.
If this solution is not effective, try another one.
Way 8.

So, so that fix this error, try this way.
Way 9.
You may encounter the issue that File Explorer keeps opening.

This post shows 4 solutions to fix the File Explorer keeps popping up.
Way 10.
Google Drive only allows you to sync files and the total size of files must be less than 15GB.

So, before syncing files, you should check the size of files.
So, before syncing files, you oughta check the file name and length.
MiniTool ShadowMaker is designed to back up files, folders, disks, partitions and the operating system.
It also enables you to sync files and folders to another location so as to keep data safe.
Download MiniTool ShadowMaker and install it on your box.
Next, clickKeep Trialto continue.
Then clickConnectinThis Computerto enter its main interface.
After entering its main interface, go to theSyncpage.
Click theSourcemodule to choose the files you want to sync.
After that, clickDestinationmodule to choose a target disk to save the syncing files.
MiniTool ShadowMaker enables you to save syncing files toAdministrator,Libraries,ComputerandShared folders.
After selecting the files and target disk, clickSync Nowto sync files.
If you come across the same issue, you could try these solutions.
So, you might read the above part to fix this error.