[schnapps] Use a regular, non time based snapshot

sysadmin/turrisos-backup.sh

@@ -6,7 +6,7 @@ HOST="maru"
 
 create_snapshot () {
     logger -p user.info -t schnapps_backup "Creating schnapps backup for host ${HOST}"
-    /usr/bin/schnapps create -t time 'Pre-export snapshot'
+    /usr/bin/schnapps create -t single "Export snapshot - ${CURRENT_DATE}"
     sleep 1 # To make sure the lock is removed
     snapshot_id=$(/usr/bin/schnapps list -j | /usr/bin/jq '.["snapshots"][-1].number')
     if /usr/bin/schnapps upload "${snapshot_id}" > /dev/null;
@@ -34,6 +34,10 @@ Hello,
 
 the schnapps backup has been created successfully on date ${DATE_PRETTY}.
 
+Currently-available snapshots:
+
+
+
 Note that snapshots older than 30 days are automatically deleted.
 
 --