Theres a guide onMiniToolcan help you When Windows Server Backup cannot access remote shared folder.

That can ruin your whole backup schedule.

Keep reading and youll get some solutions you need.

enter the name of the account you are using to take backup in the white box

Solution 1.

Check Access Permissions

Step 1.

PressWin + Eto openFile Explorerand locate & right-punch the specified shared folder.

How to Copy and Backup Files Without Admin Rights?

And choosePropertiesfrom the shortcut menu.

In theSharingtab, click onAdvanced sharingand checkShare this folderin the new popup.

Then hit on thePermissionsbutton > click onAdd.

set it to Allow the connection

Then tap onCheck Names.

When you see the match result, add it and check the option of Full access.

Finally, click onApply & OKto save.

enter the details of your shared folder

Solution 2.

Reboot your router or modem and then see if it works.

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Solution 3.

To do so:

Step 1.

TypeWindows Defender FirewallinWindows Searchand open it.

SelectAdvanced settingsto open theWindows Defender Firewall with Advanced Security on Local Computerwindow.

After making all changes, dont forget to click onApply & OK.

Solution 4.

Check out the following introduction.

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Step 1.

Launch it and clickKeep Trialto enter its main page.

After that, click onBack Up Nowto execute at once.

Wish you good luck!