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How to determine size of tar archive without creating it?

to calculate the size of a tar without creating it, with the GNU implementation of tar, use: tar --totals -cf /dev/null folder/ time tar --totals -cf /dev/null folder/ # fast!
ajneu's user avatar
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Best strategy to backup btrfs root filesystem?

Moved from edit-to-question: The solution I came up with uses btrbk, which is a single perl script that manages snapshots and automatically sends them to another drive. I documented the setup on my ...
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rsync freezes whole system

Update: Try mounting the drive read-only. (If the disk is mounted when you make the change, remember to unmount and remount for the change to take effect.) You can do this by adding the "ro"...
Andrew M.'s user avatar
1 vote

How do I refresh the magnetic state on a disks with backups?

The spinning disks do not store the bits 1:1. They encode them in codes. Also, at the lowest level, a 1 bit is stored as a change in the magnetic polarity, while 0 is stored as the same polarity. Also,...
Ondra Žižka's user avatar

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