Notes on Backing Up My Hard Disk to Blu-Ray
Commands to Follow
To distribute files into more or less evenly sized buckets (as you would when having a backup span multiple disks:
dirsplit -e4 -s 25025314816b $PATH_TO_DIR_TO_BACK_UP
dirsplit generates multiple lists of which files will live on which disk. You can preview how much each disk space will ultimately be consumed with:
cut -d= -f2 $PATH_TO_DIRSPLIT_LIST | tr '\n' '\0' | du -sch --files0-from=-
And you can use the following to generate the actual image files. Note that this will produce a hybrid UDF/ISO-9660 image file, files that are larger than 4 GB will appear to be truncated when read by drives that do not support UDF (see here and here.
mkisofs -udf -V $VOLNAME -D -r --joliet-long -graft-points -allow-limited-size -path-list $PATH_TO_DIRSPLIT_LIST -o $ISONAME
Once an image is generated, copy it down to Bruno (or equivalent desktop/laptop). Use
scp to get a progress bar, and to eliminate some of the
rsync overhead (not as necessary when there's only one file and file metadata doesn't matter).
scp [email protected]:$ISOPATH .
Here are some approximate benchmarks for how long the above steps take:
|Making an ISO Image||3-5 minutes|
|Downloading an ISO Image||7-10 minutes|
|Burning an ISO Image||60-70 minutes|
Speeds based off this LG Blu-Ray Writer.