What kind of changes? Package installation, removal and configuration? Use apt-mark showmanual to save list of manually installed packages, dpkg --get-selections | grep 'deinstall$' to save list of removed packages, debconf --get-selections to save debconf package settings, backup files that you edited in /etc. This should be enough for restoration, wouldn’t take a long time for backup and avoid risk of filesystem inconsistency.
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Cake day: June 26th, 2023
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The standard answer: don’t backup the system, automate its deployment instead. Backup only data.
With fail2ban single bot behind a NAT can make the site unaccessible for all users behind that NAT.