diff --git a/examples/block-until-remote-reachable.sh b/examples/block-until-remote-reachable.sh
new file mode 100644
index 0000000..7245314
--- /dev/null
+++ b/examples/block-until-remote-reachable.sh
@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -eu -o pipefail
+
+# Wait until the host yodaNas is reachable with SSH.
+while :; do
+  result="$(ssh yodaNas 'hostname')" && e=0 || e=$?
+  if [ "${e}" = 0 ] && [ "${result}" = 'yodaNas' ]; then
+    break
+  fi
+  printf '%s\n' 'Delaying due to SSH connectivity problems.'
+  sleep 10s
+done
diff --git a/examples/block-while-remote-file-exists.sh b/examples/block-while-remote-file-exists.sh
index a39fab8..16dff62 100644
--- a/examples/block-while-remote-file-exists.sh
+++ b/examples/block-while-remote-file-exists.sh
@@ -1,9 +1,10 @@
 #!/usr/bin/env bash
+set -eu -o pipefail
 
 # As long as there is the file `stay-alive` at host `yodaNas`,
 # this loop blocks/waits.
 while :; do
-  result="$(ssh yodaNas 'ls stay-alive 2>&1')"
+  result="$(ssh yodaNas 'ls stay-alive 2>&1')" || :
   case "${result}" in
     *"No such file or directory")
       break
diff --git a/hosts/yodaHedgehog/host-specific.nix b/hosts/yodaHedgehog/host-specific.nix
index 35604bc..44cae89 100644
--- a/hosts/yodaHedgehog/host-specific.nix
+++ b/hosts/yodaHedgehog/host-specific.nix
@@ -37,16 +37,12 @@ in
     timerConfig = {
       OnCalendar = [
         # Daily
-        "*-*-* 00:00:05"
+        "*-*-* 00:05:00"
       ];
       WakeSystem = true;
     };
   };
   systemd.services."daily-backup-and-suspend" = {
-    # If the system wakes up at 00:05, it is not directly connected to the Internet.
-    # Thus, `btrbk` might fail with the following error while connecting to `rootNas`:
-    #   ssh: Could not resolve hostname p1st.de: Name or service not known
-    # To avoid this, we depend on the `network-online` systemd target.
     after = [ "network-online.target" ];
     # Packages required for this script.
     # For `ssh` and `journalwatch`, there are assertions above.
@@ -70,6 +66,23 @@ in
       set -eu -o pipefail
       #printf '%s\n' 'Starting backup script.'
 
+      # Wait until ${backup-source} is reachable.
+      #
+      # This test is necessary because of the following:
+      # If the system wakes up at 00:05, it is not directly connected to the Internet.
+      # The config option `after = [ "network-online.target" ];` does not help in this regard.
+      # Thus, `btrbk` might fail with the following error while connecting to ${backup-source}:
+      #   ssh: Could not resolve hostname p1st.de: Name or service not known
+      #
+      while :; do
+        result="$(ssh ${backup-source} 'echo ${backup-source}')" && e=0 || e=$?
+        if [ "''${e}" = 0 ] && [ "''${result}" = '${backup-source}' ]; then
+          break
+        fi
+        printf '%s\n' 'Delaying backup due to SSH connectivity problems.'
+        sleep 10s
+      done
+
       # Pull BTRFS snapshots from ${backup-source}.
       btrbk -c /etc/btrbk/remote-backup-ssd.conf run
       btrbk -c /etc/btrbk/remote-backup-hdd.conf run
@@ -88,7 +101,7 @@ in
             printf '%s\n' 'Delaying suspend due to SSH connectivity problems.'
             ;;
         esac
-        sleep 10s
+        sleep 60s
       done
 
       # Wait until no BTRFS scrub service is running.