Re: [BackupPC-users] Large files with small changes

Le 20/11/2018 à 18:39, Craig Barratt via BackupPC-users a écrit : > Steve, > > You are exactly right - BackupPC's storage granularity is whole > files.  So, in the worst case, a single byte change to a file that is > a unique will result in a new file in the pool.  Rsync will only > transfer the de

Re: [BackupPC-users] Curious Message to PC user

On Mon, 19 Nov 2018 22:45:35 -0800 Craig Barratt via BackupPC-users wrote: This is what's very good with BPC, when you talk, the kreatuor is listening and reacting fast ;-) Jean-Yves > I pushed a fix > > for

[BackupPC-users] BackupPC 4 with separated PC and pool directories

Hi, With BackupPC 4, I understand the pc directories and the pool can be on separate filesystems. With BackupPC 3, I saw it was often recommended just to symlink /var/lib/backuppc to the actual mount point if it wasn't part of the device that holds the OS, what's the recommended way of handli

Re: [BackupPC-users] Large files with small changes

Thanks for confirming, Craig. There are lots of approaches that I could use to reduce the duplication, but they would all add complexity needlessly if BackupPC was already storing just deltas at a high granularity (and I completely understand the decision not to do so). I'm currently looking a

Re: [BackupPC-users] Large files with small changes

Steve, You are exactly right - BackupPC's storage granularity is whole files. So, in the worst case, a single byte change to a file that is a unique will result in a new file in the pool. Rsync will only transfer the deltas, but the full file gets rebuilt on the server. Before I did the 4.x rew

Re: [BackupPC-users] Large files with small changes

Thanks. Yes, I had seen that in the docs but I got the impression that the deltas referred to there were at the granularity of whole files. For example, let's say backup 1 contains files A, B and C. If B is then modified then, during the next backup rsync might only /transfer/ the deltas needed

Re: [BackupPC-users] Large files with small changes

Hi Steve, It looks like they are stored using reverse deltas. Maybe you’ve already seen this from the V4.0 documentation: * Backups are stored as "reverse deltas" - the most recent backup is always filled and older backups are reconstituted by merging all the deltas starting with the neare

[BackupPC-users] When Upgrading -> Two Pools?

Hi all, currently I am using v3 and would like to upgrade to v4. I read the docs about v4 being able to read v3 pools and using them. v4 will remove files from the v3 pool when they expire and so on. And during first backup there will be so migration (which I did not get in total...). I did no

[BackupPC-users] Large files with small changes

I think some backup programs are able to store just the changes ("deltas") in a file when making incrementals. Am I right in thinking that BackupPC doesn't do this, and would instead store the whole of each changed file as separate entries in the pool? Reason for asking is that I want to imple