I had a similar, perhaps related question. I'm making backups via tar to a SMB server, but I would rather use sftp/scp for it (the NAS supports both SMB and scp/sftp).
I don't have enough disk space to make the backup to a tarchive and then scp that tarchive. Is there a way to make scp/sftp read from a pipe or stdin, rather than specific filenames? The docs haven't mentioned it, but since the subject came up I thought it worth asking...
You can tunnel rsync through ssh, this way you only transfer changes, you transfer changes in a secure fassion, and you don't need diskspace to create a backup file that is then transfered, I use:
/usr/local/bin/rsync -Cuvaz --rsh="ssh" /path/to/src/ \ <myuser>@<myserver>:/path/to/dst
The only, but really anoying, problem about rsync is that /path/to/src/ is not treated as /path/to/src - the above does what you expect: mirror all in src to dst.
So, while you try figuring out the /'s rsync to an empty dir, then you can easily delete.
Cheers, Erik
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