How to Backup Users in Redhat

[Kumar <rsrie yahoo com>]

hello list,

  i recently installed redhat 7.3 and we have 25 users
only but in future going to increase. i want to backup
users so that when ever server get crash and just
reinstall my server and recover this users backup
file. which files do i need backup.? /etc/passwd file
is enough.?

thanks,
Kumar.

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