keep kde connect info on impermanence, test out power settings

utilities/impermanence.md

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+# Impermanence
+
+
+## Look at file changes from last root
+
+```sh
+sudo mkdir -p /btrfs-top
+sudo mount -o subvolid=5 /dev/mapper/cryptroot /btrfs-top
+LATEST_SNAPSHOT=$(sudo ls -t /btrfs-top/old_roots/ | head -n 1)
+SNAPSHOT_PATH="/btrfs-top/old_roots/$LATEST_SNAPSHOT"
+echo "Comparing against snapshot: $SNAPSHOT_PATH"
+
+# Option A: rsync
+sudo rsync -rcai --delete --dry-run \
+  --exclude='/@*' \
+  --exclude='/nix' \
+  --exclude='/proc' \
+  --exclude='/sys' \
+  --exclude='/dev' \
+  --exclude='/tmp' \
+  --exclude='/boot' \
+  --exclude='/persist' \
+  --exclude='/.snapshots' \
+  --exclude='/.swap' \
+  /var/lib/ $SNAPSHOT_PATH/var/lib/
+
+# Option B: diff (Can be very noisy, but effective)
+sudo diff -qr /var/lib $SNAPSHOT_PATH/var/lib
+```