/config
copy all *.cfg files, go file and the super.dat file. These are configuration files.
/config/shares
copy all *.cfg files. These are user share settings files.
Syslog file(s)
copy the current syslog file and any previous existing syslog files.
System
save output of the following commands:
lsscsi, lspci, lsusb, free, lsof, ps, ethtool & ifconfig.
display of iommu groups.
display of command line parameters (e.g. pcie acs override, pci stubbing, etc).
save system variables.
SMART reports
save a SMART report of each individual disk present in your system.
Docker
save files docker.log, libvirtd.log and libvirt/qemu/*.log.