Fix backup rotate for ftp/sftp mode

bin/v-backup-user

@@ -615,7 +615,7 @@ ftp_backup() {
     fi
     backups_count=$(echo "$backup_list" |wc -l)
     if [ "$backups_count" -ge "$BACKUPS" ]; then
-        backups_rm_number=$((backups_count - BACKUPS))
+        backups_rm_number=$((backups_count - BACKUPS + 1))
         for backup in $(echo "$backup_list" |head -n $backups_rm_number); do 
             backup_date=$(echo $backup |sed -e "s/$user.//" -e "s/.tar$//")
             echo -e "$(date "+%F %T") Rotated ftp backup: $backup_date" |\
@@ -770,7 +770,7 @@ sftp_backup() {
     fi
     backups_count=$(echo "$backup_list" |wc -l)
     if [ "$backups_count" -ge "$BACKUPS" ]; then
-        backups_rm_number=$((backups_count - BACKUPS))
+        backups_rm_number=$((backups_count - BACKUPS + 1))
         for backup in $(echo "$backup_list" |head -n $backups_rm_number); do
             backup_date=$(echo $backup |sed -e "s/$user.//" -e "s/.tar.*$//")
             echo -e "$(date "+%F %T") Rotated sftp backup: $backup_date" |\