chantal AT antenna DOT nl wrote on 11/26/2008 10:40:13 AM:

> Is there some way to determine approximately how many clients (or how 
> much data) can be backup up with backuppc?

Via EPIA EN 1.2GHz processor, 512MB RAM, single 750GB PATA hard drive 
backs up 4 different servers, with a total data storage of ~600GB:  2 x 
~250GB servers, the remaining servers with less than 50GB between them. 
Full backups weekly, incrementals daily.  Oh, and this is over 100Mbit.

Everybody freaks out about the amount of RAM: they tell me I need more for 
better speed.  However, I've watched vmstat throughout the process and the 
swap BI/BO remains at 0.

However, this is about the limit of the box.  On the big servers the fulls 
take about 600 minutes to complete.  The incrementals takes less than an 
hour.  All told, we get it all done easily in the 12-hour backup window, 
even if they both run at the same time.

Beyond this capacity, you'd probably be able to do it if you more 
carefully managed which servers do fulls at what time.  I don't need the 
hassle:  at this location, I have two BackupPC servers so that I don't 
have to.  Besides, at the time I built these, 750GB drives were the 
largest you could get, and I preferred using separate servers rather than 
going to an internal RAID array.

Tim Massey


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