佳礼资讯网

 找回密码
 注册

ADVERTISEMENT

查看: 1743|回复: 5

【Mac OS X】关于 Time Machine

[复制链接]
发表于 29-12-2011 10:42 AM | 显示全部楼层 |阅读模式
想问下有你们有用 Time Machine 吗?我看了这个 video,还是有些疑问。。

http://www.apple.com/findouthow/mac/#timemachinebasics

我想问,是不是我的 mac hard drive 用了多少 space 我就需要多少 space 的 storage 来back up?
比如说我的MBP现在用了80G,然后我就需要至少80G的 ext hdd 来 back up?
(这个问题照我猜想应该是不可能需要多过80G)

然后第二个问题是。。
接下来的 back up 只是 add on 而已对吗?
比如说,第一次 back up 的时候是 80G,一个月过后第二次 back up 是 85G。。
那么第二次就只是需要多5G++的 storage。
是这样吗?
(Apple 应该不可能两次 backup 就要了我的160G storage吧?

照 common sence 来想应该是这样,可是我没有弄过,所以想看谁有用的可以确定一下?
先谢谢各路英雄好汉的答复。
回复

使用道具 举报


ADVERTISEMENT

发表于 29-12-2011 12:40 PM | 显示全部楼层
据我所知timemachine 是会只在第一次backup你所有的东西,接下来只backup你更改的东西
回复

使用道具 举报

 楼主| 发表于 29-12-2011 03:47 PM | 显示全部楼层
所以第二次只是慢慢增加吧?

谢谢回复。。
回复

使用道具 举报

发表于 29-12-2011 07:19 PM | 显示全部楼层
Time Machine creates a folder on the designated Time Machine volume which is named the current date and time. It then copies all locally attached drives (except for files and directories that it has specifically been told not to copy, including the Time Machine volume itself) to the folder. Every hour thereafter, it creates a new folder on the remote drive using the same naming scheme, but instead of making another complete copy of the primary hard drive, Time Machine instead only backs up files that have changed and creates hard links to files that already exist on the remote drive. A user can browse these "versions" of the primary drive and see each file as if it were right where it was left.

Some other backup utilities save "deltas" for file changes, much like version control systems. Such an approach permits more frequent backups of minor changes but can often complicate the interaction with the backup volume. By contrast, it is possible to manually browse a Time Machine backup volume without using the Time Machine interface; the software's use of hard links makes each backup session appear to the user like a full backup, rather than an incremental or "delta" backup.

Time Machine appears to create multiple hard links to unmodified directories. Multiple linking of directories is quite different from conventional UNIX.

Apple system events record when each directory is modified on the hard drive. This means that instead of examining every file's modification date when it is activated, Time Machine only needs to scan the directories that changed for files to copy (the remainder being hard-linked). This differs from the approach taken by similar backup utilities rsync and FlyBack, which examine modification dates of all files during backup.


看懂吗?
回复

使用道具 举报

发表于 29-12-2011 07:59 PM | 显示全部楼层
谢谢楼主分享
回复

使用道具 举报

 楼主| 发表于 29-12-2011 10:56 PM | 显示全部楼层
看懂吗?
KiNd3rBu3No 发表于 29-12-2011 07:19 PM


明白了明白了,谢谢。没有看到这篇。。


  
谢谢楼主分享
danielkiet 发表于 29-12-2011 07:59 PM

我什么都没有分享倒。。
回复

使用道具 举报

Follow Us
您需要登录后才可以回帖 登录 | 注册

本版积分规则

 

ADVERTISEMENT



ADVERTISEMENT



ADVERTISEMENT

ADVERTISEMENT


版权所有 © 1996-2023 Cari Internet Sdn Bhd (483575-W)|IPSERVERONE 提供云主机|广告刊登|关于我们|私隐权|免控|投诉|联络|脸书|佳礼资讯网

GMT+8, 23-4-2024 10:01 AM , Processed in 0.063459 second(s), 24 queries , Gzip On.

Powered by Discuz! X3.4

Copyright © 2001-2021, Tencent Cloud.

快速回复 返回顶部 返回列表