Why or why not back up "/lost+found"

[Default User <hunguponcontent@gmail.com>]

Hi!

When backing up my system I have been using this exclusions list: 

/dev/*
/proc/*
/sys/*
/tmp/*
/run/*
/mnt/*
/media/*
/lost+found

There are many sources online that suggest that "/lost+found" should be
excluded from backups, but I can't seem to find a good explanation for
why.

I do not know if restoring /lost+found would mess up the file system,
or is it simply "not necessary" to back up/restore /lost+found. 

If backup/restore of /lost+found would not hurt anything, then why not
always back it up for the sake of thoroughness, "just in case".  After
all, you can't restore what you have not backed up. 

And, if /lost+found should be excluded, then shouldn't "lost+found" in
any other directories be excluded from backups as well? Why/why not? 

I think backups are important, so I would like to know now, before I
NEED to know later. 

BTW, I am currently using Timeshift for my main system backups (no home
directory), and am using rsync/rsnapshot to back up /, except for the
exclusions listed above. ("Belt and suspenders!").