Restore data insert in VM to ZFSpool

[MaxSand]

Im not in need, but have to undestand something. I have proxmox server, 3x4TB disk in RAIDZ1 pool made in ZFS. So this pool has 8TB. I made VM with Ubuntu, give him all 8TB of space as HardDisk and this will be my samba, media server with plex and so on. In future, i would like for example migrate to another VM, lets say Debian/TrueNAS/OMV etc. How cant i migrate data insert in this VM. From what I know, you cant see data uploaded in one VM which you uploaded in another. What is best solution for this?

I plan to have 2 VM. One with HA a another one with Ubuntu, where will be Plex, Jellyfin and samba. I tried TrueNAS, but had problem with deploying Jellyfin. Now I have Ubuntu on laptop with all these stuff and it work quite well, so maybe you can tell me some easy/userfriendly way, which i should try. I have to say Im complete noob and beginer with proxmox/linux and so on. All my life I work with Windows. Just need reliable home media server with HA. In short I need:

1) RaidZ1 pool
2) HomeAssistent Supervised
3) Plex and Jellyfin
4) Samba

 

[Dunuin]

So this pool has 8TB. I made VM with Ubuntu, give him all 8TB of space as HardDisk and this will be my samba, media server with plex and so on

You shouldn't do that. ZFS will become slow and fragment faster (which is bad as there is no way to degrament it) when becoming full. Usually it's recommended to not fill it more than 80% and I personally always set a 90% quota so it can't even filled more than 90% by accident. And in case you want to make use of snapshots (which is highly recommended, especially when using SMB so you got some ransomware protection via shadow copies) you want even more space for those.
So I personally wouldn't give that Ubuntu VM more than 4-6TB.

How cant i migrate data insert in this VM. From what I know, you cant see data uploaded in one VM which you uploaded in another. What is best solution for this?

You just move the contents you want to move from one VM to the other VM. How you do that is up to you, but you have to do this from within the guestOSs. For example using rsync, rclone, sshfs, syncthing, SMB, FTP or whatever you like.