APFS Mirrored External Drive Mismatch on Mac

[adamsk]

I have two 4TB Samsung T7 Shield SSDs. I mirror the primary drive to the secondary drive so that I have a backup of all my work at all times however I have noticed huge mismatches in reported sizes and available free space.

For example this is what is currently reported:

T7 Shield_1
Available = 1.42 TB
Used = 2.58 TB

T7 Shield_2
Available = 15.37 GB
Used = 3.98 TB

Please can someone help identify and resolve this issue?

[xCSxXenon]

I know you are on Mac OS, but:
https://freefilesync.org/faq.php#explorer-mismatch

I do know that MacOS and the filesystems they use do a bit of weird stuff.
Possibly related: https://apple.stackexchange.com/questions/453134/why-does-apfs-claim-my-filesystem-is-full-when-im-only-using-100-250gb
Time Machine is a common source of these discrepancies. You can use a program like "Disk Inventory X" to get another angle of the disk usage

[adamsk]

Bump! Anyone able to help here?