Vacuum cleaning of $HOME to back it up

I've started with a simple script to compress Firefox's sqlite databases before creating a backup of my $HOME directory

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alex@xubuntu:~$ cat bin/vacuumFirefox.sh #!/bin/bash   [ -n "$(pidof firefox)" ] && {   echo "ERROR: firefox is still running, close it first!"   exit 1 }   counterBefore=0 counterAfter=0   for i in ~/.mozilla/firefox/*/*.sqlite; do   fileSizeBefore=$(du -b $i|awk '{ print $1 }')   counterBefore=$((counterBefore + fileSizeBefore))   sqlite3 "$i" vacuum   fileSizeAfter=$(du -b $i|awk '{ print $1 }')   counterAfter=$((counterAfter + fileSizeAfter))   echo "$fileSizeBefore $fileSizeAfter - $(basename $i)" done echo "Bytes saved: $(( counterBefore - counterAfter ))"

Here is a sample output: