rsync: keeping groups?

[martinkk]

Hi,

Two and a half questions

1. Is it really necessary to run rsync with the -av command to also store user and group permissions?
2. if yes, how can I do that properly?

I am rsyncing /data and /home/meteohub to my NAS. I am running the following commands:

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su -c "rsync -av /data /mnt/nas_backup/_data" admin
su -c "rsync -av /home/meteohub /mnt/nas_backup/_config" admin

This means that it is ran with the user admin, which exists on the nas. The ownership attributes are stored properly, but keeping the groups is not possible. Let me provide some examples:

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rsync: chgrp "/mnt/nas_backup/_config/meteohub/histeval0" failed: Operation not permitted (1)
rsync: chgrp "/mnt/nas_backup/_config/meteohub/histeval1" failed: Operation not permitted (1)
rsync: chgrp "/mnt/nas_backup/_config/meteohub/histeval2" failed: Operation not permitted (1)
rsync: chgrp "/mnt/nas_backup/_config/meteohub/histeval3" failed: Operation not permitted (1)
rsync: chgrp "/mnt/nas_backup/_config/meteohub/lang.template" failed: Operation not permitted (1)

2,5. Does it even matter? Can I just continue with what I am doing?