Add Backups and security

Backups-and-security.md

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+Having an external backup of your home directory is mandatory. Here are a few ways to back up your data, from simplest to most feature rich.
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+- Using cron + rsync
+- On Gnome: using DejaDup (duplicity)
+- On KDE/Plasma: using KBackup or kup
+- (really advanced) using zfs or btrfs snapshots
+
+Depending on the tool used, your backups can be versioned, meaning you can recover an old file version, or a deleted file.
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+# Security
+If backing up to an external drive, I highly advise encrypting the full disk (with e.g. `cryptsetup`, the standard tool on Linux, which can is used by most disk utility GUIs). Research data can be sensitive, but your personal data (emails, cookies, history, passwords, etc.) are much more sensitive, and should not fall in the wrong hands. Encrypting your computer's internal drive is also a good security measure, and should be done when installing the OS.