I am looking at building a Pi 4 NAS using Open Media Vault using some gear I have lying around the house. I have a external WD USB 3.0 HDD and an external 4TB USB 3.0 HDD I was planning on setting up the 8TB as the main NAS drive, with some sort of solution to backup the 8TB onto the 4TB on a schedule(Compressed backups) I don't think I will ever max the 8TB as its mainly for backing up a few devices on the network via True Image 2021 Is there some sort of backup solution available on the PI, that would snapshot the external 8TB to the 4TB ?

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    It's a Linux system... so of course there are backup solutions for the RPi. Have you done any research? What was it that confused you? Did you look at rsync? Here's a search that may help you get started.
    – Seamus
    Commented May 31, 2021 at 20:04
  • As already suggestion rsync is great for secure, efficient uni-directional sync of files and folders. If you want bi-directional there is unison Or if your happy with tarballs then a combination of ssh and tar will do the job.. Commented Jun 4, 2021 at 8:48
  • There are a lot of threads about Raspberry and backup. Just search for these keywords ;-) I use raspiBackup which allows to create a backup either with rsync, tar or dd. See this thread (raspberrypi.stackexchange.com/questions/37842/…) for example for details.
    – framp
    Commented Jun 14, 2021 at 14:56


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