Drive /dev/sdf appears in your fdisk -l output, as shown above.
/dev/sdf5 seems to be mounted on /run/media/martin/Mint-KDE-Root-BK
The NTFS partitions, that had problems in your log, were /dev/sdb4 (Windows RE tools) and /dev/sd10 (Windows-New-BAK). I would say that, at least, you don’t need to mount sdb4
Aug 30 09:43:21 Martin-Manjaro-Desktop ntfs-3g[2196]: Mounted /dev/sdb4 (Read-Write, label "Windows RE tools", NTFS 3.1)
Aug 30 09:43:21 Martin-Manjaro-Desktop ntfs-3g[2215]: Mounted /dev/sdf10 (Read-Write, label "Windows-New-BAK", NTFS 3.1)
My advice is that you only automount what you need, don’t automount everything.
e2fsck is a filesystem check utility for ext4. Follow the link to learn how to use or google or duckduckgo it, there should be plenty of information on the matter.
Your baloo daemon is core dumping. If you don’t use it (it’s the file indexer), disable it with:
balooctl disable
If you want to continue using it, the core dump maybe can be solved with:
balooctl disable
balooctl purge
balooctl enable
Also, if you don’t use Snap or AppImage, I recommend to uninstall them:
sudo pacman -Rscn snapd
sudo pacman -Rscn appimagelauncher