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Re: [BackupPC-users] Incremental Seems To Backup Whole System
2010-02-19 11:29:40
All,
Thanks for all the input. I'm starting to fully understand how
BackupPC scheduling is working now. My apologies for not stating that
I was/am using rsync as it is the only choice that makes sense =)
On Fri, Feb 19, 2010 at 12:15 AM, Craig Barratt
<cbarratt AT users.sourceforge DOT net> wrote:
> Mike,
>
>> Backup# Type Comp Level Size/MB Comp/MB Comp
>> Size/MB Comp/MB Comp
>> 0 full 3 78446.6 45871.8 41.5% 258032.2
>> 155715.6 39.7%
>> 2 incr 3 276482.0 165123.8 40.3% 143.0 70.3
>> 50.8%
>
> Notice that the first full is 78GB, but the incr is 276GB.
>
> I would guess you added shares, directories or changed excludes after the
> full, but before the incremental. Or a large amount of data was added
> between these two backups.
>
>> 3 incr 3 900.7 530.7 41.1% 964.7 469.5 51.3%
>> 4 incr 3 113.5 2.7 97.6% 218.0 30.8 85.9%
>> 5 incr 3 73.4 6.1 91.7% 194.8 32.2 83.5%
>> 6 incr 3 304.3 172.2 43.4% 1735.9 944.0 45.6%
>> 7 incr 3 275955.3 165019.1 40.2% 1337.0
>> 658.0 50.8%
>> 8 incr 3 520.4 249.4 52.1% 672.7 282.5 58.0%
>> 9 incr 3 502.9 243.5 51.6% 587.6 264.1 55.1%
>> 10 incr 3 116.8 3.7 96.8% 201.5 24.3 88.0%
>> 11 incr 3 14.0 3.0 78.7% 244.3 32.8 86.6%
>> 12 incr 3 127.1 5.3 95.9% 82.2 22.3 72.8%
>> 13 incr 3 276989.9 165643.4 40.2% 329.3 40.7
>> 87.7%
>> 14 incr 3 275957.9 165146.0 40.2% 1503.5
>> 615.1 59.1%
>>
>> My question is, why did backups 13 and 14 backup all that data? Same
>> with 2 and 7 for that matter.
>>
>> Here's the times for the first few backups to give you an idea of the
>> time it's taking:
>>
>> Backup# Type Filled Level Start Date
>> Duration/mins
>> Age/days Server Backup Path
>> 0 full yes 0 2/9 07:29 1767.6 9.0
>> /backup/BackupPC/pc/fileserver/0
>> 2 incr no 1 2/10 23:59 1124.8 7.3
>> /backup/BackupPC/pc/fileserver/2
>> 3 incr no 3 2/11 19:00 68.3 6.5
>> /backup/BackupPC/pc/fileserver/3
>> 4 incr no 4 2/12 01:00 73.6 6.3
>> /backup/BackupPC/pc/fileserver/4
>> 5 incr no 5 2/12 07:00 73.9 6.0
>> /backup/BackupPC/pc/fileserver/5
>> 6 incr no 6 2/12 13:00 102.5 5.8
>> /backup/BackupPC/pc/fileserver/6
>> 7 incr no 1 2/12 19:00 1097.0 5.5
>> /backup/BackupPC/pc/fileserver/7
>
> You can see that incrementals 2 & 7 are level 1 (4th column). Since the
> full (#0) has a much smaller set of files, those level 1 incrementals
> are backing up a lot of data, and a lot more than the original full.
>
> Bottom line: you need to do a full backup. It's going to take a while
> (but no longer than the incrementals). After that, the future fulls
> and incrementals will be a lot faster.
>
> Doing a full backup is good practice if you make a significant
> configuration change that significantly changes what is being
> backed up, or add a large amount of data.
>
> Craig
>
Craig,
I see exactly what you're saying. What I'm thinking happened was that
I was doing testing on one directory and ran the full, and then added
the rest of my directories after. Using the explanations earlier
about how increment levels and fulls relate, it makes perfect sense.
Thanks again!
Regards,
Mike
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