diff --git a/backup.sh b/backup.sh
index 1acdf845..f58e20c8 100755
--- a/backup.sh
+++ b/backup.sh
@@ -7,6 +7,7 @@
 ## Ajout de la synchro des news et des homes : Sayan 15/11/2003
 ## Ajout de la synchro du wiki et de jabber : Manathan 01/05/2004
 ## Ajout de la synchro de mailman : Manathan 02/05/2004
+## Passage en modulo 4 semaine pour les sauv par rsync : Manathan 05/05/2004
 
 ## Que sauvegarder ?
 confs="etc usr/cvs-rep CRANS usr/scripts boot/config*" # via bzip2
@@ -32,21 +33,21 @@ rm -rf $temp_dir
 # archive, compress, sparse, hard links, CVS exclude, remote shell
 # archive is rlptgoD : recursive, symlinks, perms, times, group, owner, Devices
 # suppr les fichiers non existant sur zamok
-# synchro journalière, switch par semaine
+# synchro journalière, switch par semaine sur 4 rep
 week=$(date +%W) # numéro de la semaine
-#week_mod2=$(( $week % 2 ))
+week_mod4=$(( $week % 4 ))
 
 ## Sauvegarde du Site web et des News et du wiki
-rsync -atzSHe ssh --delete $site_web backupcrans@pegase:~/backup-$week/httpd || exit 4
-rsync -atzSHe ssh --delete $news backupcrans@pegase:~/backup-$week/var/spool || exit 6
-rsync -atzSHe ssh --delete $wiki backupcrans@pegase:~/backup-$week/wiki || exit 7
-rsync -atzSHe ssh --delete $jabber backupcrans@pegase:~/backup-$week/jabber || exit 8
-rsync -atzSHe ssh --delete $mailman backupcrans@pegase:~/backup-$week/mailman || exit 9
+rsync -atzSHe ssh --delete $site_web backupcrans@pegase:~/backup-$week_mod4/httpd || exit 4
+rsync -atzSHe ssh --delete $news backupcrans@pegase:~/backup-$week_mod4/var/spool || exit 5
+rsync -atzSHe ssh --delete $wiki backupcrans@pegase:~/backup-$week_mod4/wiki || exit 6
+rsync -atzSHe ssh --delete $jabber backupcrans@pegase:~/backup-$week_mod4/jabber || exit 7
+rsync -atzSHe ssh --delete $mailman backupcrans@pegase:~/backup-$week_mod4/mailman || exit 8
 
 ## Sauvegarde des mails
 # rsync change le atime quand il lit le fichier, on perd la date de dernière consultation des mails pour le ménage des comptes
 mount /var/spool/mail -o remount,noatime
-rsync -atzSHe ssh --delete $mails backupcrans@pegase:~/backup-$week/var/spool || exit 5
+rsync -atzSHe ssh --delete $mails backupcrans@pegase:~/backup-$week_mod4/var/spool || exit 9
 mount /var/spool/mail -o remount,atime
 
 ## Sauvegarde des homes
@@ -54,7 +55,7 @@ mount /var/spool/mail -o remount,atime
 # "Permission denied" errors occur because backupcrans is not root on pegase. Ignoring
 temp=$(mktemp)
 temp_mail=$(mktemp)
-rsync -atzSHe ssh --delete $homes backupcrans@pegase:~/backup-$week &> $temp
+rsync -atzSHe ssh --delete $homes backupcrans@pegase:~/backup-$week_mod4 &> $temp
 cat $temp | grep -viEe "^((recv_generator)|(opendir)|(stat)).*Permission denied$" | grep -vie "^skipping non-regular file" | grep -vie "^rsync error: some files could not be transferred" | grep -vie "^file has vanished" > $temp_mail
 if [ -s $temp_mail ]
 then