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starting out w/ rdiff-backup, having permissions issues

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uc50ic4more

I have 2 machines - SERVER and BACKUP. On SERVER I have a script that backs up a few directories and databases, ending up in /var/local/backup with permissions intact (ownership is root and www-data on all of the files).

I'd like to use rdiff-backup on BACKUP to retrieve the contents of /var/local/backup on SERVER and sync it to, for example, /var/local/backup on BACKUP.

I have a user on both machines, USER1, and can ssh from BACKUP into SERVER as USER1; but USER1 cannot read the contents of /var/local/backup on SERVER nor write to /var/local/backup locally on BACKUP.

I would strongly prefer to not allow root access via ssh and I'd prefer not to chown/ chgrp the entirety of the files placed in /var/local/backup on SERVER.

My first thought was to add USER1 to the www-data group but that strikes me as possibly unwise from a security standpoint and doesn't address access to files owned by root.

I am at a loss and am beginning to suspect that there is an elegant answer out there. I would appreciate it if someone could point me toward it.

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