dsnap-sync template: snapper options for derived dsnap-sync configs

- adapt to rely on systemd units
- enable timeline cleanups, since snapshots are marked to support
  this algorithm
- typo correction for SNAP_SYNC_EXCLUDE

etc/snapper/config-templates/dsnap-sync

@@ -23,24 +23,23 @@ SYNC_ACL="yes"
 BACKGROUND_COMPARISON="yes"
 
 
-# run daily number cleanup
-NUMBER_CLEANUP="no"
+# handele NUMBER_CLEANUP via systemd, if a timer unit is active
+NUMBER_CLEANUP="yes"
 
 # limit for number cleanup
 NUMBER_MIN_AGE="1800"
-NUMBER_LIMIT="50"
-NUMBER_LIMIT_IMPORTANT="10"
+NUMBER_LIMIT="52"
+NUMBER_LIMIT_IMPORTANT="12"
 
-# "no": we will use systemd.timer
-TIMELINE_CREATE="no"
+# handle TIMELINE via systemd, if a timer unit is active
+TIMELINE_CREATE="yes"
 
-# create cron based cleanup entries
-# "no": we will use systemd.timer
-TIMELINE_CLEANUP="no"
+# create a systemd.timer unit to handle TIMELINE cleanup
+TIMELINE_CLEANUP="yes"
 
-# snap-sync: timeline settings
+# timeline settings
 TIMELINE_MIN_AGE="1800"
-TIMELINE_LIMIT_HOURLY="0"
+TIMELINE_LIMIT_HOURLY="1"
 TIMELINE_LIMIT_DAILY="14"
 TIMELINE_LIMIT_MONTHLY="11"
 TIMELINE_LIMIT_YEARLY="2"
@@ -54,7 +53,7 @@ EMPTY_PRE_POST_MIN_AGE="1800"
 
 # uncomment to exclude this subvol when calling
 # snap-sync as timer unit
-# SNAP_SUNC_EXCLUDE="yes"
+# SNAP_SYNC_EXCLUDE="yes"
 
 # uncomment if your config will be used as snapshot-clone
 #CHILD_CONFIG=true