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Type of backup used for Online Backup

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Does anyone know what type of backup is used for Online Backup?

Is it full each time, incremental or differential?

If you set cleanup for 10 versions... what happens when it hits the limit?

Thanks in advance.

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Online backups typically use database to identify and store objects, so there is no notion of a full versus a partial. Each file that is supposed to be backed up is stored the first time it is backed up, then all subsequent versions are stored as versions until the file is deleted on the computer.
If you set the cleanup to 10 versions, this means that after the 11 version is backed up, you lose version #1.
If you set the cleanup to versions older than X months, any file deleted more than X months ago will be lost, and any version created more than X months ago will be lost as well.

Thanks Pat,

So if I back up 10 mb of files, every day for 10 versions and they never change I'll only be using 10 mb.
But if one file, say a 1 mb file, changes, once then I'll be using 11 mb. Until 10 days later, when it should go back to 10 mb, because the previous versions were deleted.

Right?

Pat,
I figured it out. Thanks for your help.

Now all I have to do is get it to recover.

Chuck,

To be clear: if you have 20 files for a total of 10MB, and you back up everyday and they don't change at all, you will be using 10MB.
If one file of 2MB changes everyday (without changing size, to simplify), you will be using 8mb (for the non changing files) plus 10 versions of 2MB. or 20mb = 28mb.
If you don't turn on the time limit retention rule, and you delete the file after 4 versions, all 4 versions will be retained as they get older.

Note that some services count older versions and deleted versions against the customer quota, and some don't. I don't know whether this is what worries you, but just in case. My understanding is that Acronis Online Backup counts everything.