Snapshot backup Post: 302717171

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Operating Systems OS X (Apple) Snapshot backup Post 302717171 by DGPickett on Wednesday 17th of October 2012 03:49:08 PM

10-17-2012

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I have a continuous Mozy Internet backup so intermediate changes are not vulnerable long, and a usb 1TB hard drive I plug in to each box in rotation to catch it up. The Mozy took 3 days to restore my saved files last time, alone. So, I have no gap.

Now, to do offsite with external hard drive, get extras so the one on site to be written is not the most recent prior copy, like backup tapes. The Internet product is still wise, as it makes the window of vulnerability very short. If you use network not sneakers to move the backup data offsite, you can merge the two. Have a local copy very quickly updated and great for restores, and a remote copy that may lag more, is slow for restores but ensures the data is still online if that center goes down. Disk is cheap, data is priceless. Mirrored data centers can ensure that data is and processing are both in multiple distinct places. A compressed stream of updates both ways can keep them pretty close in sync without slowing either host.

Good old MULTICS had no hard links, and any change rippled up the tree into directory status all the way to the root, so you could find just the modified files with zero effort. Modern file systems and volume managers can support backup systems with similar lists. After the fact new file discovery is slow and loads the system more.

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LEARN ABOUT MINIX

backup

BACKUP(8)						      System Manager's Manual							 BACKUP(8)

NAME

       backup - backup files

SYNOPSIS

       backup [-djmnorstvz] dir1 dir2

OPTIONS

       -d     At top level, only directories are backed up

       -j     Do not copy junk:  *.Z, *.bak, a.out, core, etc

       -m     If device full, prompt for new diskette

       -n     Do not backup top-level directories

       -o     Do not copy *.o files

       -r     Restore files

       -s     Do not copy *.s files

       -t     Preserve creation times

       -v     Verbose; list files being backed up

       -z     Compress the files on the backup medium

EXAMPLES

       backup -mz . /f0    # Backup current directory compressed

       backup /bin /usr/bin
			   # Backup bin from RAM disk to hard disk

DESCRIPTION

       Backup (recursively) backs up the contents of a given directory and its subdirectories to another part of the file system.  It has two typ-
       ical uses.  First, some portion of the file system can be backed up onto 1 or more diskettes.  When  a  diskette  fills	up,  the  user	is
       prompted for a new one.	The backups are in the form of mountable file systems.	Second, a directory on RAM disk can be backed up onto hard
       disk.  If the target directory is empty, the entire source directory is copied there, optionally compressed to save space.  If  the  target
       directory  is  an  old  backup,	only  those  files  in	the target directory that are older than similar names in the source directory are
       replaced.  Backup uses times for this purpose, like make.  Calling Backup as Restore is equivalent to using the -r  option;  this  replaces
       newer files in the target directory with older files from the source directory, uncompressing them if necessary.  The target directory con-
       tents are thus returned to some previous state.

SEE ALSO

       tar(1).

																	 BACKUP(8)