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Deleting older full Backup + My Docs BU question

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I experienced an error last night running my scheduled My Documents backup. My guess is that it did not have enough space, as I only show 14.8 Mb remaining on my external N:drive.
I have the My Documents scheduled weekly, and the C:backup scheduled monthly.
Screenshot of various backup sizes attached:
I have two questions.
The original C backup was run on March 5, 181 Mb. The next one was run on April 3, also 181 Mb. These appear to be two complete total backups. Is that correct ? And if so, and I only want/need to keep the most recent full backup, how do I delete the oldest one ? Or is there a way to have the oldest one deleted automatically so I don’t run out of space ?

Second question. The My Docs backups were first run on March 6. Each subsequent My Docs backup was smaller than the previous one, so I assume it’s only backing up what changed each week. However, last night’s backup, with a date of 4/16 is very large. Almost as large as my original My Docs backup. It appears that it was attempting to run a full, not incremental, backup of My Documents, and because it didn’t have enough space, it failed the backup. Is that correct ? And if so, how to a prevent this from happening ?

Perhaps it’s my settings that I don’t really understand, but I believe I didn’t change anything, and keep all the settings as the default settings.
Please advise,
Thanks,
Steve

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Which version of ATI are you using? With 2010 or 2011, you can tell ATI to run full backups and to keep only X versions. After X+1 versions, the first backup is deleted. So even if you choose to keep only 1 version, ATI will first complete a new full backup before erasing the previous one. This might not solve your space issue.

Yes, it looks like your documents backup tasks is set up to run one full, then 6 incrementals, then a new full etc. You can also tell ATI to keep only X backup version chains (full + incrementals chain). After it has completed X chains, ATI will first do a new full backup, before erasing the first 7 backups (one full, and the 6 incrementals attached to it).

Your guess is right, you don't have enough space to complete the backup.

My recommendation is to buy a bigger disk for the backup: they come pretty cheap these days, and having the right backup history is key.

Also, it looks like you backup only your C:\ partition. Make sure that your system disk backup includes all the partitions of the disk where C:\ is. This is the only way you can guarantee you can restore your system on a new disk, for example.

Thank you.

2011. That was it. I freed up space on my external, and last nights backup ran cleanly.

Thanks again,

Steve