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[rdiff-backup-users] rdiff-backup streaming?

From: Mark Price
Subject: [rdiff-backup-users] rdiff-backup streaming?
Date: Thu, 17 Feb 2011 10:41:55 -0700

Question -

We use rdiff (not rdiff-backup) to do our incremental file backups. 

We do:
  1. Copy the file to a staging area (so the file won't disappear or be modified while we work on it)
  2. Hash the original file, and computes an rdiff signature (used for delta differencing)
  3. Comput an rdiff delta difference (if we have no prior version, this step is skipped)
  4. Compress & encrypt the resulting delta difference
Our problem is all of these things happen in separate phases, distinctly one from the other.  This means it takes a long time to do its job.  What I am wondering is if rdiff-backup does all of these things in one read/write file pass in a streaming manner, or if it simply calls to the standard rdiff.exe (which isn't working for us)?  I didn't quite see information concerning this in the docs or wiki.  We have considered using xdelta (because it operates in a streaming manner) but the problem with xdelta is that it stores double copies of the deltas and kills storage space.  Any help on this matter would be great!

Mark Price

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