Make backups a ton, ton more betterer

roles/backup/defaults/main.yml

@@ -3,6 +3,9 @@ backup_script: s3backup
 restore_script: s3restore
 # When to kick off backups using the systemd timer
 backup_time: "*-*-* 02:00:00"
+# What variation should the systemd timer have?
+# Default value of "5400" is 1h30min in seconds
+backup_time_randomization: "5400"
 # What format should the datestamps in the filenames of any backups be in?
 # Defaults to YYYY-MM-DD-hhmm
 # So January 5th, 2021 at 3:41PM would be 2021-01-05-1541

roles/backup/templates/backup.timer

@@ -5,6 +5,7 @@ Description=Nightly backup timer
 [Timer]
 Persistent=true
 OnCalendar={{ backup_time }}
+RandomizedDelaySec={{ backup_time_randomization }}
 
 [Install]
 WantedBy=timers.target

roles/backup/templates/s3backup.sh

@@ -76,7 +76,6 @@ backup() {
 	# --keep-tag foo	Keeps all snapshots tagged with "foo"
 	# --host "$HOSTNAME"	Only act on *our* snapshots. We assume other machines are taking
 	#			care of their own houses.
-	# --prune		Remove orphaned blobs when we remove snapshots
 	/opt/restic-wrapper \
 		--verbose \
 		forget \
@@ -85,7 +84,6 @@ backup() {
 		--keep-monthly 6 \
 		--keep-tag noremove \
 		--host "$HOSTNAME" \
-		--prune
 }
 
 # Dump Postgres DBs, if possible