Trying to repair MY P 4TB

Somehow since the last Catalina update I am now unable to perform a Time Machine Back-up. Now seems corrupted and unsure how to go about it.

Hi,

You could refer to the following link: How to Check External Drive for Errors or Failure on macOS

Can I set up a call tomorrow, to see how to go about my issue?

Jonty.S I have the same issue, can you help me?

When I run the first aid I get the following information:
Running First Aid on “2TB-MAC-MARM” (disk3)

Verifying storage system
Performing fsck_cs -n -x --lv --uuid C778D99E-6BE4-49F3-A91B-7BCB53FD69AF
Checking volume
disk2s2: Scan for Volume Headers
disk2s2: Scan for Disk Labels
Logical Volume Group C778D99E-6BE4-49F3-A91B-7BCB53FD69AF on 1 device
disk2s2: Scan for Metadata Volume
Logical Volume Group has a 24 MB Metadata Volume with double redundancy
Start scanning metadata for a valid checkpoint
Load and verify Segment Headers
Load and verify Checkpoint Payload
Load and verify Transaction Segment
Incorporate 0 newer non-checkpoint transactions
Load and verify Virtual Address Table
Load and verify Segment Usage Table
Load and verify Metadata Superblock
Load and verify Logical Volumes B-Trees
Logical Volume Group contains 1 Logical Volume
Load and verify 550A5034-7762-4675-916A-302B97736D46
Load and verify A0117D9F-1291-4CD7-BFF9-B670A38EF102
Load and verify Freespace Summary
Load and verify Block Accounting
Load and verify Live Virtual Addresses
Newest transaction commit checkpoint is valid
Load and verify Segment Cleaning
The volume C778D99E-6BE4-49F3-A91B-7BCB53FD69AF appears to be OK
Storage system check exit code is 0.
Repairing file system.
Volume is already unmounted.
Performing fsck_hfs -fy -x /dev/rdisk3
Checking Journaled HFS Plus volume.
The volume could not be verified completely.
File system check exit code is 8.
Restoring the original state found as unmounted.
File system verify or repair failed.

Operation failed…

I have Mojave installed on my Macbook Pro, and the drive has a password protection and has partition for PC and Mac