TODO: mksysb, cpio, duplicity, deja-dup, cronopete

UNIX Backup for quick Restore

Backup for quick Restore retaining directory structure 

The key to the quick restore is to backup files under the same mount point so that mv commands are almost instantaneous.

This script caters for a scenario where the directory you need to backup is itself a mount point by backing up to a subdirectory that is explicitly excluded from the backup set....

Backup

mkdir /toplevel/backupdir

find /toplevel/ -maxdepth 1 -not -path "/toplevel/backupdir" -not -path "/toplevel/" -exec cp -Rav {} /toplevel/backupdir \;

Restore

This combination of commands basically swaps the existing structure for the backup structure (i.e. it allows you to backout the restore if necessary).

find /toplevel/ -maxdepth 1 -type d -not -path "/toplevel/backupdir" -not -path "/toplevel/" -exec mv -f {} {}_old \;

mv /toplevel/backupdir/* /toplevel/

Remember to clean up files/directories that are no longer required.

Monitor Progress

If you start this script off immediately after you kick off the backup then the value of y should be reasonably accurate and the script will report approximate percentage complete each minute...

y=$(du -s upgrade_copy1 | cut -f1)

while [ 1 ]

do

  date

  x=$(du -s upgrade_copy1 | cut -f1)

  x=$((x*100))

  z=$((x/y))

  echo $z

  sleep 60

done

Worked Example

Make a multi-level directory structure.

In this example we will create directories under /restore/temp...

cd /restore/temp

mkdir -p level1-1/level2-1/level3-1

mkdir -p level1-1/level2-1/level3-2

mkdir -p level1-1/level2-1/level3-3

mkdir -p level1-1/level2-1/level3-4

mkdir -p level1-1/level2-2/level3-1

mkdir -p level1-1/level2-2/level3-2

mkdir -p level1-1/level2-2/level3-3

mkdir -p level1-1/level2-2/level3-4

mkdir -p level1-1/level2-3/level3-1

mkdir -p level1-1/level2-3/level3-2

mkdir -p level1-1/level2-3/level3-3

mkdir -p level1-1/level2-3/level3-4

mkdir -p level1-1/level2-4/level3-1

mkdir -p level1-1/level2-4/level3-2

mkdir -p level1-1/level2-4/level3-3

mkdir -p level1-1/level2-4/level3-4

mkdir -p level1-2/level2-1/level3-1

mkdir -p level1-2/level2-1/level3-2

mkdir -p level1-2/level2-1/level3-3

mkdir -p level1-2/level2-1/level3-4

mkdir -p level1-2/level2-2/level3-1

mkdir -p level1-2/level2-2/level3-2

mkdir -p level1-2/level2-2/level3-3

mkdir -p level1-2/level2-2/level3-4

mkdir -p level1-2/level2-3/level3-1

mkdir -p level1-2/level2-3/level3-2

mkdir -p level1-2/level2-3/level3-3

mkdir -p level1-2/level2-3/level3-4

mkdir -p level1-2/level2-4/level3-1

mkdir -p level1-2/level2-4/level3-2

mkdir -p level1-2/level2-4/level3-3

mkdir -p level1-2/level2-4/level3-4

mkdir -p level1-3/level2-1/level3-1

mkdir -p level1-3/level2-1/level3-2

mkdir -p level1-3/level2-1/level3-3

mkdir -p level1-3/level2-1/level3-4

mkdir -p level1-3/level2-2/level3-1

mkdir -p level1-3/level2-2/level3-2

mkdir -p level1-3/level2-2/level3-3

mkdir -p level1-3/level2-2/level3-4

mkdir -p level1-3/level2-3/level3-1

mkdir -p level1-3/level2-3/level3-2

mkdir -p level1-3/level2-3/level3-3

mkdir -p level1-3/level2-3/level3-4

mkdir -p level1-3/level2-4/level3-1

mkdir -p level1-3/level2-4/level3-2

mkdir -p level1-3/level2-4/level3-3

mkdir -p level1-3/level2-4/level3-4

mkdir -p level1-4/level2-1/level3-1

mkdir -p level1-4/level2-1/level3-2

mkdir -p level1-4/level2-1/level3-3

mkdir -p level1-4/level2-1/level3-4

mkdir -p level1-4/level2-2/level3-1

mkdir -p level1-4/level2-2/level3-2

mkdir -p level1-4/level2-2/level3-3

mkdir -p level1-4/level2-2/level3-4

mkdir -p level1-4/level2-3/level3-1

mkdir -p level1-4/level2-3/level3-2

mkdir -p level1-4/level2-3/level3-3

mkdir -p level1-4/level2-3/level3-4

mkdir -p level1-4/level2-4/level3-1

mkdir -p level1-4/level2-4/level3-2

mkdir -p level1-4/level2-4/level3-3

mkdir -p level1-4/level2-4/level3-4

Backup...

find /restore/temp/ -maxdepth 1 -not -path "/restore/temp/backupdir" -not -path "/restore/temp/" -exec cp -Rav {} /restore/temp/backupdir \;

Restore...

find /restore/temp/ -maxdepth 1 -type d -not -path "/restore/temp/backupdir" -not -path "/restore/temp/" -exec mv -f {} {}_old \;

mv /restore/temp/backupdir/* /restore/temp/

Bibliography