It maintains a list of every file and its hash, and compares both sets of files against that list, then flags anything that changed and either copies it or prompts the user to make a decision. Unison is a file synchronization tool, not really a backup program. Retrospect looks for changes pretty much the same way as CrashPlan does. Once in a while (I configured this for 28 days), it checks the hash of every file and compares with what’s in the backup archive. If a file is already on the list, and its size and timestamp hasn’t changed, then it skips it. In years past, I used Retrospect and briefly Windows Backup.ĬrashPlan maintains a list of files which were already backed up, and their hash. I use various other tools to back up other OS’s. I use rsync and CrashPlan to back up my Windows computers. I haven’t tried to set Archive bit over Samba, but it wouldn’t surprise me if that didn’t translate.
The filesystem is shared via “Samba” which is Windows-sharing software for Linux. Drobo NAS devices (and their competitors QNAP and Synology) don’t natively use NTFS.
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