Update cheatsheets

tldr/linux/vzdump

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# vzdump
+
+> Backup Utility for virtual machines and containers.
+> More information: <https://pve.proxmox.com/pve-docs/vzdump.1.html>.
+
+- Dump a guest virtual machine into the default dump directory (usually `/var/lib/vz/dump/`), excluding snapshots:
+
+`vzdump {{vm_id}}`
+
+- Back up the guest virtual machines with the IDs 101, 102, and 103:
+
+`vzdump {{101 102 103}}`
+
+- Dump a guest virtual machine using a specific mode:
+
+`vzdump {{vm_id}} --mode {{suspend|snapshot}}`
+
+- Back up all guest systems and send an notification email to the root and admin users:
+
+`vzdump --all --mode {{suspend}} --mailto {{root}} --mailto {{admin}}`
+
+- Use snapshot mode (no downtime required) and a non-default dump directory:
+
+`vzdump {{vm_id}} --dumpdir {{path/to/directory}} --mode {{snapshot}}`
+
+- Back up all guest virtual machines excluding the IDs 101 and 102:
+
+`vzdump --mode {{suspend}} --exclude {{101, 102}}`