https://www.gnu.org/software/tar/manual/html_section/Using-Multiple-Tapes.html
Might do kind of what you want.
this post was submitted on 21 Dec 2023
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Something like mergerfs? I think this is what Unraid uses if I remember right.
If OP cant use more than one disk at once, how can they benefit from mergerfs?
Yeah you’re right. Scratch that then
Thank you!
Git annex can do that and keep track of which drive the files are on.
It's going to take a little work here, but I have a large drive on my plex, and a couple of smaller drives that I back everything up to. On the large drive get a list of the main folders. You can do a "du -h --max-depth=1 | sort -hk1" on the root folder to get an idea of how you should split them up. Once you have an idea, make two files, each with their own list of folders (eg: folders1.out and folders2.out) that you want to go to each separate drive. If you have both of the smaller drives mounted, just execute the rsync commands, otherwise, just do each rsync command with the corresponding drive mounted. Here's an example of my rsync commands. Keep in mind I am going from an ext4 filesystem to a couple of ntfs drives, which is why I use the size only. Make sure and do a dry run or two, and you may or may not want the '--delete' command in there. Since I don't want to keep files I have deleted from my plex, I have it delete them on the target drive also.
sudo rsync -rhi --delete --size-only --progress --stats --files-from=/home/plex/src/folders1.out /media/plex/maindrive /media/plex/4tbbackup
sudo rsync -rhi --delete --size-only --progress --stats --files-from=/home/plex/src/folders2.out /media/plex/maindrive /media/plex/other4tbdrive
I ran into the same problem some months ago when my cloud backups stopped being financially viable and I decided to recycle my old drives. For offline backups mergerfs will not work as far as I understand. Creating tar archives of 130TB+ also doesnt sound like a good option. Some of the tape backup solutions looked to be possible options, but are often complex and use special archive formats...
I ended up writing my own solution in python using json state files. It's complete enough to run the backup, but otherwise very work-in-progress with no restore at all. So I do not want to publish it.
If you find a suitable solution I am also very interested 😅
Im going to say that doesnt exist and restoring from it would be a nightmare. You could cobble together a shell or python script that does that though.
You're better off just getting a drive bay and plugging all the drives in at once as an LVM.
You could also do the opposite, which is split the 4TB into the different logical volumes. Each the same size as a drive.
It wouldn't be so complicated to restore as long as they keep full paths and don't split up subdirectories. But yeah, sounds like they'd need a custom tool to examine their dirs and do a solve a series of knapsack problems.
If you are lucky enough, borgbackup could deduplicate and compress the data enough to fit a 1tb drive. Depending on the content of course, but it's deduplication & compression is really insanely efficient for certain cases. (I have 3 devices with ~900GB each (so just shy of 3TB in total) which all gets stored in a ~400gb borgbackup)
You'll have ask the question of how important is this data, then before you start run drive diagnostic tool to see if all are functioning as expected, I'd suggest moving directories aposed to chopping anything up as to maintain some form of redundancy if a drive were to fail. It'll be a long process. Hope it goes well
Resync is a handy tool
This is really is not a good idea for a backup.
Probably not the answer you're looking for but I'd probably build a dedicated nas.