--- title: Proxmox Backup Auto-Shutdown | daily.dev description: A homelab operator walks through automating power management for a Proxmox Backup Server to reduce electricity costs. Since the HP Microserver doesn't support... canonical: https://daily.dev/posts/proxmox-backup-auto-shutdown-ujgry2wsh twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Proxmox Backup Auto-Shutdown | daily.dev og:description: A homelab operator walks through automating power management for a Proxmox Backup Server to reduce electricity costs. Since the HP Microserver doesn't support... og:url: https://daily.dev/posts/proxmox-backup-auto-shutdown-ujgry2wsh og:image: https://api.daily.dev/og/posts/uJgRY2wSh.png og:image:alt: Proxmox Backup Auto-Shutdown og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Proxmox Backup Auto-Shutdown **[apalrd's adventures](https://daily.dev/sources/apalrd)** · 5 min read · 0 upvotes · 0 comments ## Summary A homelab operator walks through automating power management for a Proxmox Backup Server to reduce electricity costs. Since the HP Microserver doesn't support S3 suspend and lacks swap space for hibernate, the solution uses full shutdown with Wake-on-LAN for wake-up. The setup involves systemd timer and service units to send a WoL magic packet at 19:05 daily, plus a bash script that polls proxmox-backup-manager until all tasks finish before shutting down. Additional optimizations include mounting the root SD card with noatime, symlinking Proxmox task logs to a ZFS dataset to protect the SD card, and increasing the ZFS ARC limit from 50% to 75% of RAM (12GB) for better caching performance. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I automatically shut down my Proxmox Backup Server after backups finish and wake it up again on a schedule? Use a systemd timer to send a Wake-on-LAN magic packet (via the `wakeonlan` utility) at a fixed time each day, then a second systemd timer that fires 5 hours later to run a bash script polling `proxmox-backup-manager` until no tasks remain before issuing shutdown. The WoL timer fires early enough for the server to fully boot before scheduled backups begin. _Homelab operators automating Proxmox power schedules share setups like this on daily.dev._ ### How do I move Proxmox Backup Server task logs off the root SD card to a ZFS dataset? Create a ZFS dataset (e.g., `backup/logs`), rsync the existing `/var/log/proxmox-backup/tasks` directory into it, delete the original directory, and symlink the ZFS path back to `/var/log/proxmox-backup/tasks`. Fix ownership to `backup:backup` with chown on both the dataset and the symlink target so Proxmox can write logs correctly. _Proxmox storage tips and ZFS tuning discussions surface regularly for homelab builders on daily.dev._ ### How do I increase the ZFS ARC cache limit on a Proxmox system beyond the default 50% of RAM? Calculate the desired ARC size in bytes and write `options zfs zfs_arc_max=` into `/etc/modprobe.d/zfs.conf`. For example, 12GB is 12884901888 bytes. The change takes effect on the next boot. The default ZFS ARC max is 50% of system RAM; raising it to 75% benefits systems whose primary workload is ZFS storage. _ZFS tuning decisions for Proxmox and similar storage servers get discussed by practitioners on daily.dev._ ## Similar posts on daily.dev - [Proxmox wastes power by default, and the fix takes a single setting](https://daily.dev/posts/proxmox-wastes-power-by-default-and-the-fix-takes-a-single-setting-mrgkev4pn) · XDA Developers · 0 upvotes · 0 comments - [More random home lab things I've recently learned](https://daily.dev/posts/more-random-home-lab-things-i-ve-recently-learned-e7ucih6lp) · Hacker News · 10 upvotes · 0 comments - [Proxmox Backup Server is the boring home lab upgrade that made me less afraid to break things](https://daily.dev/posts/proxmox-backup-server-is-the-boring-home-lab-upgrade-that-made-me-less-afraid-to-break-things-hxyzppueq) · XDA Developers · 4 upvotes · 2 comments - [Automate Proxmox security updates the right way](https://daily.dev/posts/automate-proxmox-security-updates-the-right-way-s9dv0cihz) · All Things Open · 0 upvotes · 0 comments - [My Proxmox backups stopped being a storage nightmare with this workaround](https://daily.dev/posts/my-proxmox-backups-stopped-being-a-storage-nightmare-with-this-workaround-cxw3bmesc) · XDA Developers · 0 upvotes · 0 comments --- Tags: [#linux](https://daily.dev/tags/linux), [#homelab](https://daily.dev/tags/homelab), [#proxmox](https://daily.dev/tags/proxmox) [View this post on daily.dev](https://daily.dev/posts/proxmox-backup-auto-shutdown-ujgry2wsh) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Proxmox Backup Auto-Shutdown","url":"https://daily.dev/posts/proxmox-backup-auto-shutdown-ujgry2wsh","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/proxmox-backup-auto-shutdown-ujgry2wsh"},"datePublished":"2026-08-11T08:56:25.618Z","dateModified":"2026-08-11T09:07:15.274Z","description":"A homelab operator walks through automating power management for a Proxmox Backup Server to reduce electricity costs. 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