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Best way to backup large drive of mostly static data

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I have a half full 2x3TB RAID 0 array (stupid big, stupid fast) I'm trying to keep backed up to a network drive . Most of the data on it doesn't change much (Steam games and downloads) What's the best backup scheme to keep this protected while at the same time prevent repeated large lengthy backups? Right now it wants to do a full backup once a week but my computer never stays on long enough throughout the week for it to even finish one full backup before the next one would start. I don't really need a lengthily file history just an up to date copy if the array fails.

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If your disk contains non-system files that are in already compressed file format, I wouldn't use Acronis True Image to back this up. Even a file backup in ATI will put all your files in a proprietary container. If the container gets corrupted, you lose your entire backup.

Do a simple file copy on a regular basis, or use sync software (I use Syncback SE but there are other solutions, like Windows File History, for example). With these options, the files are copied "flat" without compression or container. Because they work at the file level, they just copy the changed files, or (like File History, or Genie Timeline, the blocks changed within files)