diff --git a/install.sh b/install.sh
index 83cc2a6..9f36c92 100644
--- a/install.sh
+++ b/install.sh
@@ -1,18 +1,115 @@
 #!/bin/bash
 
+###### CONFIG SECTION ######
+
 # Define basic tools to install
 TOOLS="vim ifupdown2 net-tools dnsutils ethtool git curl unzip screen iftop lshw smartmontools nvme-cli lsscsi sysstat zfs-auto-snapshot htop mc rpl"
 
-# Define zfs-auto-snapshot retention policy
-SNAP_FREQUENT=8
-SNAP_HOURLY=48
-SNAP_DAILY=31
-SNAP_WEEKLY=8
-SNAP_MONTHLY=3
+# Define target dataset for backup of /etc
+# IMPORTANT NOTE: Don't type in the leading /, this will be set where needed
+PVE_CONF_BACKUP_TARGET=rpool/pveconf
 
-# Define zfs arcsize in Megabytes (MB)
-ZFS_ARC_MIN=128
-ZFS_ARC_MAX=256
+# Define timer for your backup cronjob (default: every 15 minutes)
+PVE_CONF_BACKUP_CRON_TIMER="*/15 * * * *"
+
+###### SYSTEM INFO AND INTERACTIVE CONFIGURATION SECTION ######
+
+#### L1ARC SIZE CONFIGURATION ####
+
+# get total size of all zpools
+ZPOOL_SIZE_SUM_BYTES=0
+zpool list -o size -Hp | while read size_per_pool; do
+    ZPOOL_SIZE_SUM_BYTES=$(($ZPOOL_SIZE_SUM_BYTES + $size_per_pool))
+done
+
+# get information about available ram
+MEM_TOTAL_BYTES=$(free -tb | tail -1 | cut -d ' ' -f3)
+
+# get values if defaults are set
+ARC_MAX_DEFAULT_BYTES=$((MEM_TOTAL / 2))
+ARC_MIN_DEFAULT_BYTES=$((MEM_TOTAL / 32))
+
+# get current settings
+ARC_MIN_SET_BYTES=$(cat /sys/module/zfs/parameters/zfs_arc_min)
+ARC_MAX_SET_BYTES=$(cat /sys/module/zfs/parameters/zfs_arc_max)
+
+# calculate suggested l1arc sice
+ZFS_ARC_MIN_BYTES=$(($ZPOOL_SIZE_SUM_BYTES / 4096))
+ZFS_ARC_MAX_BYTES=$(($ZPOOL_SIZE_SUM_BYTES / 1024))
+
+echo -e "######## CONFIGURE ZFS L1ARC SIZE ########\n"
+echo "System Summary:"
+echo -e "\tSystem Memory:\t$(($MEM_TOTAL_BYTES / 1024 / 1024)) MB"
+echo -e "\tZpool size (sum):\t$(($ZPOOL_SIZE_SUM_BYTES / 1024 / 1024)) MB"
+echo -e "Calculated l1arc if set to defaults:"
+if [ $ARC_MIN_DEFAULT_BYTES -lt 33554432 ]; then
+    echo -e "\tDefault zfs_arc_min:\t32 MB"
+else
+    echo -e "\tDefault zfs_arc_min:\t$(($ARC_MIN_DEFAULT_BYTES / 1024 / 1024)) MB"
+fi
+echo -e "\tDefault zfs_arc_max:\t$(($ARC_MAX_DEFAULT_BYTES / 1024 / 1024)) MB"
+echo -e "Current l1arc configuration:"
+if [ $ARC_MIN_SET_BYTES > 0]; then
+    echo -e "\tCurrent zfs_arc_min:\t$(($ARC_MIN_SET_BYTES / 1024 / 1024)) MB"
+else
+    echo -e "\tCurrent zfs_arc_min:\t0"
+fi
+if [ $ARC_MAX_SET_BYTES > 0]; then
+    echo -e "\tCurrent zfs_arc_max:\t$(($ARC_MAX_SET_BYTES / 1024 / 1024)) MB"
+else
+    echo -e "\tCurrent zfs_arc_max:\t0"
+fi
+echo -e "Note: If your current values are 0, the calculated values above will apply."
+echo ""
+echo "The l1arc cache will be set relative to the size (sum) of your zpools by the policy 'zfs_arc_min = 256 MB / 1 TB' and 'zfs_arc_max = 1 GB / 1 TB'"
+echo "zfs_arc_min=\t$(($ZFS_ARC_MIN_BYTES / 1024 / 1024)) MB"
+echo "zfs_arc_max=\t$(($ZFS_ARC_MAX_BYTES / 1024 / 1024)) MB"
+echo ""
+RESULT=not_set
+while [[ "$(echo $RESULT | awk '{print tolower($0)}')" != "y" ]] && [[ "$(echo $RESULT | awk '{print tolower($0)}')" != "n"]]; do
+    echo "You can now adjust the l1arc values. Change settings [y/N]?"
+    read
+    RESULT=${REPLY}
+done
+if [[ "$(echo $RESULT | awk '{print tolower($0)}')" == "y" ]]; then
+    echo "Please type in the desired value in MB for 'zfs_arc_min' [$(($ZFS_ARC_MIN_BYTES / 1024 / 1024))]:"
+    read
+    if [[ ${REPLY} -gt 0 ]]; then
+        $ZFS_ARC_MIN_BYTES=$((${REPLY} * 1024 * 1024))
+    fi
+    echo "Please type in the desired value in MB for 'zfs_arc_max' [$(($ZFS_ARC_MAX_BYTES / 1024 / 1024))]:"
+    read
+    if [[ ${REPLY} -gt 0 ]]; then
+        $ZFS_ARC_MAX_BYTES=$((${REPLY} * 1024 * 1024))
+    fi
+fi
+
+#### ZFS AUTO SNAPSHOT CONFIGURATION ####
+
+# get information about zfs-auto-snapshot and ask for snapshot retention
+dpkg -l zfs-auto-snapshot
+declare -A auto_snap_keep
+if [ $1 -ne 0 ]; then
+    auto_snap_keep["frequent"]=8 ; auto_snap_keep["hourly"]=48 ; auto_snap_keep["daily"]=31 ; auto_snap_keep["weekly"]=8 ; auto_snap_keep["monthly"]=3
+else
+    for interval in "${auto_snap_keep[@]}"; do
+        if [[ "$interval" == "frequent" ]]; then
+            auto_snap_keep["$interval"]=$(cat /etc/cron.d/zfs-auto-snapshot | grep keep | cut -d' ' -f19 | cut -d '=' -f2)
+        else
+            auto_snap_keep["$interval"]=$(cat /etc/cron.$interval/zfs-auto-snapshot | grep keep | cut -d' ' -f6 | cut -d'=' -f2)
+        fi
+    done
+fi
+echo -e "######## CONFIGURE ZFS AUTO SNAPSHOT ########\n"
+for interval in "${auto_snap_keep[@]}"; do
+    echo "Please set how many $interval snapshots to keep (current: keep=${auto_snap_keep[$interval]})"
+    read
+    if [ "${auto_snap_keep[$interval]}" != "${REPLY}" ]; then
+        auto_snap_keep["$interval"]=${REPLY}
+    fi
+done
+
+###### INSTALLER SECTION ######
 
 # disable pve-enterprise repo and add pve-no-subscription repo
 mv /etc/apt/sources.list.d/pve-enterprise.list /etc/apt/sources.list.d/pve-enterprise.list.bak
@@ -24,15 +121,19 @@ DEBIAN_FRONTEND=noninteractive DEBIAN_PRIORITY=critical apt -y -qq dist-upgrade
 DEBIAN_FRONTEND=noninteractive DEBIAN_PRIORITY=critical apt -y -qq install $TOOLS
 
 # configure zfs-auto-snapshot
-rpl "keep=4" "keep=$SNAP_FREQUENT" /etc/cron.d/zfs-auto-snapshot
-rpl "keep=24" "keep=$SNAP_HOURLY" /etc/cron.hourly/zfs-auto-snapshot
-rpl "keep=31" "keep=$SNAP_DAILY" /etc/cron.hourly/zfs-auto-snapshot
-rpl "keep=8" "keep=$SNAP_WEEKLY" /etc/cron.weekly/zfs-auto-snapshot
-rpl "keep=8" "keep=$SNAP_MONTHLY" /etc/cron.monthly/zfs-auto-snapshot
-
-# set zfs_arc_limits
-ZFS_ARC_MIN_BYTES=$(($ZFS_ARC_MIN*1024*1024))
-ZFS_ARC_MAX_BYTES=$(($ZFS_ARC_MAX*1024*1024))
+for interval in "${auto_snap_keep[@]}"; do
+    if [[ "$interval" == "frequent" ]]; then
+        CURRENT=$(cat /etc/cron.d/zfs-auto-snapshot | grep keep | cut -d' ' -f19 | cut -d '=' -f2)
+        if [[ "${auto_snap_keep[$interval]}" != "$CURRENT" ]]; then
+            rpl "keep=$CURRENT" "keep=${auto_snap_keep[$interval]}" /etc/cron.d/zfs-auto-snapshot
+        fi
+    else
+        CURRENT=$(cat /etc/cron.$interval/zfs-auto-snapshot | grep keep | cut -d' ' -f6 | cut -d'=' -f2)
+        if [[ "${auto_snap_keep[$interval]}" != "$CURRENT"]]; then
+            rpl "keep=$CURRENT" "keep=${auto_snap_keep[$interval]}" /etc/cron.$interval/zfs-auto-snapshot
+        fi
+    fi
+done
 
 echo $ZFS_ARC_MIN_BYTES > /sys/module/zfs/parameters/zfs_arc_min
 echo $ZFS_ARC_MAX_BYTES > /sys/module/zfs/parameters/zfs_arc_max
@@ -42,3 +143,12 @@ options zfs zfs_arc_min=$ZFS_ARC_MIN_BYTES
 options zfs zfs_arc_min=$ZFS_ARC_MAX_BYTES
 EOF
 update-initramfs -u -k all
+
+# create backup jobs of /etc
+zfs list $PVE_CONF_BACKUP_TARGET
+
+if [ $? -ne 0 ]
+    zfs create $PVE_CONF_BACKUP_TARGET
+fi
+
+echo "$PVE_CONF_BACKUP_CRON_TIMER root rsync -rtvupo /etc /$PVE_CONF_BACKUP_TARGET" > /etc/cron.d/pve-conf-backup
\ No newline at end of file