Ubuntu readme

ubuntu/README.md

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+# Ubuntu Server 22.04
+
+## Cron jobs
+
+### arg
+
+```
+# Backup to B2
+0 6 * * * backup archives b2
+0 7 * * * backup backups b2
+0 8 * * * backup documents b2
+0 9 * * * backup literature b2
+0 10 * * * backup photos b2
+0 11 * * * backup videos b2
+# Backup to Google Drive
+0 12 * * * backup documents gdrive
+0 13 * * * backup literature gdrive
+# Backup to Google Photos
+0 14 * * * backup photos gphotos
+# Backup to Hetzner
+0 17 * * * backup archives hetzner
+0 18 * * * backup backups hetzner
+0 19 * * * backup documents hetzner
+0 20 * * * backup literature hetzner
+0 21 * * * backup photos hetzner
+0 22 * * * backup videos hetzner
+```
+
+### root
+
+```
+45 23 * * * zfs-auto-snapshot --quiet --syslog --label=daily --prefix=cron --skip-scrub --recursive --keep=30 archive
+```
+
+## ZFS tweaks
+
+### Disable frequent snapshots creation
+
+```sh
+zfs set com.sun:auto-snapshot:frequent=false <dataset>
+```
+
+### Disable `zfs-auto-snapshot` completely
+
+```sh
+zfs set com.sun:auto-snapshot=false <dataset>
+```