I've seen a number of sources suggest it can be useful to back up /etc.  E.g. the presentation Supporting Debian machines for friends and family.For any serious backup, we also need a well-defined restore process (which we can test periodically :-).How do you restore these system files, from a backup which includes ownership information?  Give an example of a working restore process.  State any assumptions made.  You may assume the backup tool of your choice, e.g. tar or etckeeper.  Example of files with specific owners:$ ls -l|grep -v root roottotal 2240-rw-r-----.  1 root brlapi     33 Nov 15 21:32 brlapi.key-rw-r-----.  1 root chrony    481 Nov 21 11:03 chrony.keysdrwxr-xr-x.  4 root lp       4096 Apr 18 10:58 cups-rw-------.  1 tss  tss      7046 Feb  5  2016 tcsd.conf
How could you possibly preserve file ownership in a backup (/etc)?
users;backup;etc;restore