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A common backup software solution used by hosting providers is the Idera CDP suite, which uses the hcp (hot-copy) utility to take point-in-time snapshots without LVM/ZFS/btrFS, etc. The hot-copy tool is available for free. Please also see: CentOS Hot Backup


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Linode in particular uses a custom agent in the host OS to back up at a file level. (Linode does some crazy iSCSI stuff that most of us mere mortals will never mess with.) A more widely-used solution is LVM's "snapshot" target (sample write-up here) which is more or less good at hot backups. Basically, if you're using Logical Volume Management, you can tell ...


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Regarding your first question: No, you take a snapshot of complete logical volumes. Please see Taking a Backup Using Snapshots in the LVM HowTo for details. Hint: reading the HowTo completely surely wouldn't cause harm. ;) As of your second question: think of it? How should the data be copied over without being copied over? At one point in time, the data ...


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I can't neccessarily speak to vBox, but the following applies to VMware. When you delete a file from a VM with an active snapshot, the delta disk doesn't increase by the size of a deleted file. I can confirm this because, after the comments to Michael's answer, I went and tested it on my vSphere 5.5 system. The Test Picked a VM with an quiet secondary ...


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You've got it exactly backward: If you revert to your snapshot, then whatever is in it is replayed (in reverse) and merged to the volume from which the snapshot was taken. This makes the volume identical to the snapshot, and the snapshot is destroyed. If you delete the snapshot, nothing at all is merged; the snapshot is simply destroyed and your volume, ...


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Add another VM in the Hosted Service while you are doing the Snapshot. The Hosted Service (and hence the VIP) won't be deleted if there is at least one VM in it. After you are done with the snapshot, delete the temporary VM.


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You need to reserve the ip using powershell or preview portal. Unfortunately, you can only reserve ip address during VM creation. You will have to delete the cloud service and recreate it using a reserved ip. That way you won't lose it after restart or shutdown. Reserved Public IP https://msdn.microsoft.com/en-us/library/azure/dn690120.aspx My blog post ...


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Yes, btrfs does share parts of files in snapshots. It does not reallocate the entire file. Snapshots work the same as other COW operations, according to the official wiki. The original blocks are pointed to in the snapshot, and if the file is changed in the snapshot, COW makes a new extent. COW does this whether there is none, one, or a hundred prior ...



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