After the friendly hints where to find Clonezilla I tried to boot into it but got some problems. The bootloader is telling me, that it is not able to find the iso.
I have installed the kernel plugin, then inside the plugin downloaded the clonezilla image, chosen to boot once into the image and finally rebooted.
The disks are btrfs. I first installed debian and on top OMV.
root@NAS:~# findmnt
TARGET SOURCE FSTYPE OPTIONS
/ /dev/sdd2[/@rootfs] btrfs rw,relatime,ssd,space_cache,subvolid=256,subvol=/@rootfs
├─/sys sysfs sysfs rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/security securityfs securityfs rw,nosuid,nodev,noexec,relatime
│ ├─/sys/fs/cgroup cgroup2 cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot
│ ├─/sys/fs/pstore pstore pstore rw,nosuid,nodev,noexec,relatime
│ ├─/sys/firmware/efi/efivars efivarfs efivarfs rw,nosuid,nodev,noexec,relatime
│ ├─/sys/fs/bpf none bpf rw,nosuid,nodev,noexec,relatime,mode=700
│ ├─/sys/kernel/debug debugfs debugfs rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/tracing tracefs tracefs rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/config configfs configfs rw,nosuid,nodev,noexec,relatime
│ └─/sys/fs/fuse/connections fusectl fusectl rw,nosuid,nodev,noexec,relatime
├─/proc proc proc rw,nosuid,nodev,noexec,relatime
│ └─/proc/sys/fs/binfmt_misc systemd-1 autofs rw,relatime,fd=30,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=1660
├─/dev udev devtmpfs rw,nosuid,relatime,size=3977060k,nr_inodes=994265,mode=755
│ ├─/dev/pts devpts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
│ ├─/dev/shm tmpfs tmpfs rw,nosuid,nodev
│ ├─/dev/mqueue mqueue mqueue rw,nosuid,nodev,noexec,relatime
│ └─/dev/hugepages hugetlbfs hugetlbfs rw,relatime,pagesize=2M
├─/run tmpfs tmpfs rw,nosuid,nodev,noexec,relatime,size=799048k,mode=755
│ ├─/run/lock tmpfs tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k
│ ├─/run/rpc_pipefs sunrpc rpc_pipefs rw,relatime
│ ├─/run/docker/netns/default nsfs[net:[4026532008]]
│ │ nsfs rw
│ ├─/run/user/1000 tmpfs tmpfs rw,nosuid,nodev,relatime,size=799044k,nr_inodes=199761,mode=700,uid=1000,gid=100
│ ├─/run/docker/netns/b75367a99d7a nsfs[net:[4026533029]]
│ │ nsfs rw
│ ├─/run/docker/netns/738d9898bced nsfs[net:[4026532740]]
│ │ nsfs rw
│ ├─/run/docker/netns/c398ead90754 nsfs[net:[4026532362]]
│ │ nsfs rw
│ ├─/run/docker/netns/d6c63a813322 nsfs[net:[4026532288]]
│ │ nsfs rw
│ ├─/run/docker/netns/3a492299d69b nsfs[net:[4026532448]]
│ │ nsfs rw
│ ├─/run/docker/netns/452e1ee6c1dc nsfs[net:[4026532520]]
│ │ nsfs rw
│ ├─/run/docker/netns/434d8ca21ea0 nsfs[net:[4026532597]]
│ │ nsfs rw
│ ├─/run/docker/netns/87ca62dbbcc6 nsfs[net:[4026532885]]
│ │ nsfs rw
│ ├─/run/docker/netns/de1c16c924ab nsfs[net:[4026532813]]
│ │ nsfs rw
│ ├─/run/docker/netns/7cfac2e5ce13 nsfs[net:[4026532669]]
│ │ nsfs rw
│ └─/run/docker/netns/6ab385499c73 nsfs[net:[4026532957]]
│ nsfs rw
├─/tmp tmpfs tmpfs rw,relatime
├─/boot/efi /dev/sdd1 vfat rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=ascii,shortname=mixed,utf8,e
├─/home /dev/sdd5 btrfs rw,relatime,ssd,space_cache,subvolid=5,subvol=/
├─/var /dev/sdd6 btrfs rw,relatime,ssd,space_cache,subvolid=5,subvol=/
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