Newsgroup: it.comp.macintosh
Titolo: Tecnologia Time Machine su Tiger...

Rapido "sondaggino": sento spesso che la tecnologia della Time Machine
implementata in Leopard è disponibile anche su tiger...
Quali software? :-|
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 Quali software? :-|
Time machine implemente una procedura di backup incrementale e quindi in
teoria sono diponibili molto programmi meno coreografici ma che di base
dorniscono la stessa funzione. Il vantaggio di Time machine sarà
l'integrazione nel sistema operativo, si parla che possa lavorare
addirittura a livello di file system, ma al momento queste sono
speculazioni. 
Hellis

:
Introducing Time Machine
Robert Ulrich
Sr. Software Engineer
Time Machine is Apple's built-in backup solution for Leopard. Existing 
backup solutions can be intimidating and inconvenient. Backups may not 
happen automatically, and it can be difficult to find the information 
later. The design goals for Time Machine were to be simple to 
configure, integrated with the system, automated, convenient to use, 
and compatible.
The basic system requirements for Time Machine are that you are using 
Leopard, have an external hard disk (USB 2 or Firewire), or an AFP 
server with a high bandwidth connection (via wired ethernet or 
Airport). The backup format is journaled HFS Plus.
To configure Time machine you choose a disk, and flip the switch. Time 
Machine is integrated with the Finder. It is integrated with the 
installer so that you can backup your system as part of the Leopard 
install process. Backups are always online and accessible. Backups are 
viewable on Tiger and Panther, are not encoded or compressed, and not 
just a single data blob.
Time Machine allows you to restore system from backup. By default, all 
files needed to restore a system disk are backed up. System changes and 
updates are captured, since most are not large relative to disk.
Everything is backed up once per day. Rolling backups are kept for the 
last few hours By default, automatic backups of changes are done on a 
roling basis each hour, and at the end of the day the last hourly 
backup is kept as daily backup. Users may optionally specify only once 
per day at specific time.
By default , all backups are kept indefinitely. Users may specify a 
time period instead. If enabled, when disk gets full, older backups are 
removed. If there is still not enough room then users should consider 
buying a larger disk, decrease the preservation period or manually 
delete backups.
Backups are indexed by Spotlight, though currently standard Spotlight 
queries do not include backups. Special options will be added to search 
backups (not implemented in the WWDC seed).
Backups are grouped by machine name and date, with separate entries 
appear for each disk partition. Special ACLs are added to make backups 
read only.
Restoring backups
--Data can be restored using Time Machine application
--browse with any file management tool
--Installer can restore entire system from a backup
--Migration Assistant can migrate directly from backup
How Time machine works
--the initial backup contains everything
--Use FSEvents to determine what has changed (new to Leopard, filesystem
broadcasts changes to you)
--changed files are copied to a new backup directory
--Unchanged files are hard linked to their previous version
--If a folder is changed, then all contents are linked. To reduce the number of
potential hardlinks, unchanged folders are linked with archive directory links.
Bundle files are related and need to be in sync. It is possible that 
files may change while a backup is being made. The new filesystem API 
called FSEvents can be called to determine if any copied files have 
changed. If so, then those changed files are recopied. This process 
repeats until files are stable or timeout.
You can exclude unnecesary files from backups such as temporary files, 
cache files, index files and large rebuildable files. There are several 
ways to exclude files from a backup. One is to use an existing location 
(temp files in /tmp, cache files in /library/caches). Your application 
may exclude files (marked as do not backup) by a specific path or by 
specific item. Your application can call CSBackupIsItemExcluded() to 
see if an item is excluded.
Within your application, use FSCopyObject to copy files from a backup. 
This function will handle archive directory links correctly, and 
restores original permissions. It is the same copy engine as Finder and 
Time Machine.
There are some definite limits of Time Machine in the WWDC seed:
--No FileVault support implemented right now. You can do FileVault backups to
individual disk images with a password. Backing up individual files is 
still under
consideration since you must be logged in to see FileVault files.
--backup is on a per machine basis
--although planned for the GM release, there is no user interface to exclude
specific files from a backup in the WWDC seed.
--Archive of backups is not currently on the plate of to do's.
--Backup over SMB will be supported, and NFS should also work. Users can set
exclusion through preferences and maybe via Get Info.
--No tie in to Workgroup manager to let administrators decide what gets 
excluded.
--As of now, secure delete/trash does not hit the backups, but it is 
being look at.
--How to handle mobile home directories is still under consideration.

 implementata in Leopard è disponibile anche su tiger...
Time Machine fa il backup.
Il backup è possibile farlo con molte applicazioni. Quello che rende
Time Machine differente è che è integrato con OS X, per cui i documenti
sono copiati "in background" mentre lavori e man mano che sono
modificati.
Altre applicazioni utilizzabili per il backup su Tiger sono SuperDuper!
(consigliato da muà), Carbon Copy Cloner (consigliato da tutti) et al.
-- 
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-- 
http://infinite-labs.net

 Airport). The backup format is journaled HFS Plus.
Immagino e spero che funzionerà anche con dischi SATA interni, per quei
computer che potranno averli... 

 dorniscono la stessa funzione.
Eheh... cercavo proprio qualcosa di fruibile in modo immediato con
un'interfaccia easy to use (o coreografica, come dici tu! :)
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perchè questa opzione su un pc di un mio amico non funziona?
esce scritto che itunes no0n può sfogliare copertine su questo 
computer.
di cosa ha bisogno il programmma???
grazie in anticipo per le risposte.
-- 
Francesco.R
www.iaciners.org

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