It`s an 1TB USB 3.0 portable HD, I had something arough 700GB stored, 400Gb of it was Time Machine and the rest from File History (Windows 10 automatic backup). I am using them basically to do backups from mac and windows.
I made a HD scan and they found (lot of) errors, so I removed all partitions, recreated a single NTFS and enabled only Time Machine now (almost all my windows files planned to have backup are also in my Mac through OneDrive, so the Windows backup is redundant), I ran scan disk again and its not finding any new issue.
The only error that I can see now from System Log is this:
Mar 27 10:27:55 cnid_dbd[1231]: Couldn't open extension maping file /usr/etc/extmap.conf
Mar 27 10:27:55 cnid_dbd[1231]: Couldn't load extension -> type/creator mappings file "/usr/etc/extmap.conf"
No idea how to solve this, but thanks =)
I am monitoring it again and I expect to not see another freezing episode, I was travelling this weekend as I was unable to access my desktop remotely because of this, was worrkied about some bad thing happening in my house =/