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I only have a SFTP access on my NAS, on Lacie OS 3.X, (so exit rsync) and i want to backup it from a remote debian server.

The problem is that the NAS is 4TB and it can take a lot of time if i transfert all files everytimes.

Is there a simple way to do that, based on modification time and or file size in a small script or a command line ?

closed as off-topic by dawud, HopelessN00b Mar 30 '15 at 20:45

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3

It seems that your NAS can be configured to perform remote backups (which appears to be what you want). This line is of interest

... It can also be a third-party NAS compatible with rsync.

In your case, the remote debian server should be considered a NAS. I expect you can configure rsyncd on it and then configure the NAS to use it as a target.

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    I didn't know that Rsync can be used as a daemon. It work, Thanks a lot ! – bigben3333 Mar 31 '15 at 11:32

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