From 0e0d28b53161a3754d2e0bc7203bbd364ed4218b Mon Sep 17 00:00:00 2001
From: Matt Speer <mwspeer@gmail.com>
Date: Sat, 3 Oct 2026 15:15:00 -0500
Subject: [PATCH] fix(backup): exclude snap unit files from systemd rsync

Excludes snap-generated mount files (`*snap*.mount`) and `snapd.mounts.target.wants`
from the `/etc/systemd/system` rsync backup task.

Prevents 'Invalid argument (22)' errors caused by escaped backslashes (`\x2d`)
in dynamic snap mount file names when syncing to non-POSIX destination filesystems.
---
 host_backup.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/host_backup.sh b/host_backup.sh
index 3990950..32fb47e 100644
--- a/host_backup.sh
+++ b/host_backup.sh
@@ -103,7 +103,10 @@ fi
 # Task 4: Backup Custom Systemd Units & Services
 # ==============================================================================
 if [ -d "$SYSTEMD_SOURCE" ]; then
-    rsync -aL "$SYSTEMD_SOURCE/" "$CURRENT_BACKUP_DIR/systemd/"
+    rsync -aL \
+        --exclude='*snap*.mount' \
+        --exclude='snapd.mounts.target.wants' \
+        "$SYSTEMD_SOURCE/" "$CURRENT_BACKUP_DIR/systemd/"
     echo "Backed up: $SYSTEMD_SOURCE"
 else
     echo "Warning: Systemd directory '$SYSTEMD_SOURCE' not found." >&2