https://backupforum.progforums.com/BackupForum Backup forum en http://backend.userland.com/rss https://backupforum.progforums.com/BackupForum/viewtopic.php?pid=707#p707 707@https://backupforum.progforums.com/BackupForum Topic: Changes that trigger a backup on a linux host Message: Thanks for posting your findings. Wed, 01 Jun 2022 23:48:30 +0100 https://backupforum.progforums.com/BackupForum/viewtopic.php?pid=706#p706 706@https://backupforum.progforums.com/BackupForum Topic: Changes that trigger a backup on a linux host Message: In my previous post, I was asking about some things that would trigger a backup to occur on a linux host.  So, here's a list of the tests that I ran:Things that did NOT trigger a backup:1) Changing permissions2) Changing ownership3) Changing inode(I'm really happy about #3... that means I can move files to a new disk and, provide all the paths stay the same, they will not get backed up again)Things that DID trigger a backup1) Changing the timestamp (either forwards or backwards)2) Changing the file size (even if you force the timestamp to be unchanged)3) Changing the file in a way that keeps the same sizeI tested moving timestamps backwards to simulate if you placed an older copy of the file in place.  So, ANY timestamp change triggers a backup, even if you do not modify the file.Also, I did want to make sure that the backup wasn't triggered just on the file size, so I did a set of modifications that kept the same file size, and as expected, they triggered a backup.  That was probably just being a bit paranoid, but just wanted to be sure.So, it's a reasonable backup solution for linux provided you're basically a single user.Trying to do system-level backups is probably not great because:o  It doesn't handle permissions and ownerships at all (which renders it virtually useless for a system-level install)o  It doesn't handle symlinks correctly (they should be backed up as a symlink, NOT as a file/directory that the link points ato  I assume that it probably doesn't handle other types of special files (hard links, semaphores, sockets, etc.) though I didn't test them out.All in all, I'm happy to use it as a user-level backup solution. Wed, 01 Jun 2022 23:03:51 +0100