First well working version

arch_update

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+#! /bin/sh -
+#Full Arch Linux Update Script
+
+SNAPSHOT_DIR=/.snapshots
+DAYS_TO_KEEP=90
+
+# Backup system
+if which btrfs >/dev/null; then
+    echo -e '\nCreating backup...' >&2
+
+    cur_time=$(date -Is)
+    cur_time_s=$(date -d $cur_time +%s)
+
+    for file in $(ls "$SNAPSHOT_DIR"); do
+        old_time_s=$(date -d $(echo "$file" | sed 's/[[:alpha:]]\+-//') +%s)
+        if [ $(((cur_time_s - old_time_s) / 86400)) -gt $DAYS_TO_KEEP ]; then
+            sudo btrfs subvolume delete "$SNAPSHOT_DIR"/"$file"
+        fi
+    done
+
+    sudo btrfs subvolume snapshot / "$SNAPSHOT_DIR"/root-$cur_time
+    sudo btrfs subvolume snapshot /home "$SNAPSHOT_DIR"/home-$cur_time
+fi
+
+# Check dependencies
+echo -e '\nInstalling dependencies ...' >&2
+! which curl >/dev/null 2>&1 && sudo pacman -Syu curl
+! which git >/dev/null 2>&1 && sudo pacman -Syu git
+! which rankmirrors >/dev/null 2>&1 && sudo pacman -Syu pacman-contrib
+if ! which yay >/dev/null 2>&1; then
+    sudo pacman -Syu
+    git clone https://aur.archlinux.org/yay.git
+    cd yay
+    makepkg -cirs
+    cd ..
+    rm -fr yay
+fi
+! which yaycache >/dev/null 2>&1 && yay -Syu yaycache
+
+# Update mirrors
+echo -e '\nUpdating mirrors ...' >&2
+curl -s 'https://archlinux.org/mirrorlist/?country=DE&protocol=https&use_mirror_status=on' | sed -e 's/^#\(Server\)/\1/' -e '/^#/d' | rankmirrors - | sudo tee /etc/pacman.d/mirrorlist
+
+# Update system
+echo -e '\nUpdating system ...' >&2
+yay -Syu
+
+# Remove orphans
+echo -e '\nRemoving orphans ...' >&2
+orphans=$(yay -Qtdq)
+[ ! "X$orphans" = 'X' ] && yay -Rns $orphans
+
+# Clean cache
+echo -e '\nCleaning cache ...' >&2
+sudo paccache -r
+yaycache -r
+
+# Find new configs
+echo -e '\nSearching for new configs ...' >&2
+sudo pacdiff
+
+echo -e '\nIt is recommended to restart the system.'