did sb. use odabr successfully by specifying -rsize?
[root@ebro01 odabr]# ./odabr backup -destination /filer/aaa/bbb/backup-ls/backup_ccc -rsize 30 -osize 60 -usize 200
INFO: 2019-11-18 15:18:36: Checking LVM size
ERROR: 2019-11-18 15:18:36: Available LVM size '16 Gb' is less then required snapshot size '60 Gb', exiting...