external backup

[deneb]

to backup my data on an external disk I used:

# zfs snapshot -r internal_pool@backup
# zfs send -R internal_pool@backup | zfs receive -vF external_pool

the second command finished after some hours with the following message:

cannot mount 'external_pool': mountpoint or dataset is busy

looking at the sizes of the data imported it seems that the backup is slightly smaller than the original data. What went wrong? How to recover?

 

[deneb]

Insted of using send receive I now tryed to use the replication task from the GUI. The process ended successfully. Even though some directory seems to be slighly smaller. Not sure why and how to check the correctness of the data.

I then ran the same replication task again and I saw it incrementally apply the last snapshot.
Not sure why there are this small size differencies but everything seems to work properly.

Any way to be 100% all the files are there? I tried snapshot diff, but it seems to no work for different pools.

 

[subhuman]

Not sure why there are this small size differencies but everything seems to work properly.

Different compression settings maybe?

 

[deneb]

so the setting was the same, probably small differencies between the current status and the last snapshot.
Thanks for the help