auto backup mongo (ruby version and very concise)

autobackupmongo.rb

#!/usr/local/ruby/bin/ruby -w
Dbpath = "/data/db"             # database path
Backpath = "/data/dbbackup"     # backup directory 
Host = ""                       # mongo host to connect,empty is for local
Database = ""                   # database to use. empty is for all
Collection = ""                 # collection to use 
User = ""
Passwd = ""
Now = Time.now
DATE = Now.strftime("%Y-%m-%d")
Dom = Now.mday                  # Day of month
Dow = Now.wday                  # Day of week
M = Now.month                   # Month of the year
W = Now.strftime("%W")          # Week of the year
Doweekly = 6                    # Saturday 
Opt = ""                        #Options

if !Host.empty?
    Opt = Opt << " --host #{Host}"
end

if !User.empty?
    Opt = Opt << " --username #{User} --password #{Passwd}"
end

if !Database.empty?
    Opt = Opt << " --db #{Database}"
end

if !Collection.empty?
    Opt = Opt << " --collection #{Collection}"
end

def dbdump(bkpath)
    `mongodump --out #{bkpath} #{Opt}`  
end

#Create required directory
#first check backup directory exist?
if Dir[Backpath] == [] 
    `mkdir -p #{Backpath}`
end

#check daily exist?
if Dir["#{Backpath}/daily"] == [] 
    `mkdir -p '#{Backpath}/daily'`
end

#check weekly exist?
if Dir["#{Backpath}/weekly"] == [] 
    `mkdir -p '#{Backpath}/weekly'`
end

#check monthly exist?
if Dir["#{Backpath}/monthly"] == [] 
    `mkdir -p '#{Backpath}/monthly'`
end

#make monthly backup
if Dom=="1"
    bkpath=Backpath+"/monthly/"+DATE+"."+M.to_s
    puts "Monthly backup begin.."
    dbdump bkpath
end

#make daily backup
if Dow==Doweekly 
    puts "Delete last week backup"
    `rm -rf #{Backpath+"/weekly/*."+W.to_s+".*"}`
    puts "Weekly backup begin.."
    bkpath=Backpath+"/weekly/"+DATE+"."+W.to_s
    dbdump bkpath
else
    puts "Delete backup 7 days ago"
    `rm -rf #{Backpath+"/daily/*."+Dow.to_s+".*"}`
    bkpath=Backpath+"/daily/"+DATE+"."+Dow.to_s
    puts "Daily backup begin..."
    dbdump bkpath
end