Update cheatsheets

tldr/idevicebackup2

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# idevicebackup2
+
+> Create or restore backups for devices running iOS 4 or later.
+> More information: <https://manned.org/idevicebackup2>.
+
+- Create a backup of the device in the specified directory:
+
+`idevicebackup2 backup {{path/to/directory}}`
+
+- Restore a backup from the specified directory:
+
+`idevicebackup2 restore {{path/to/directory}}`
+
+- Enable encryption for backups:
+
+`idevicebackup2 encryption on {{password}}`
+
+- List the files in the last completed backup:
+
+`idevicebackup2 list`