上次全备份以来经过的时间。
备份类型——只启用全备份。
可用性——在使用循环日志模式时，只能进行离线全备份。
Availability - With circular logging mode, only offline full backup is possible.
增量备份是最近一次成功的全备份以来的所有修改的备份。
An incremental backup is a backup of all changes since the most recent successful, full backup.
我们在早上四点、下午四点和晚上12点会对所有数据库做全备份。
We take full database backups of all databases at 4 AM, 4 PM, and 12 AM.
增量备份就是对最近一次数据库全备份以来所有修改了的数据进行备份。
Incremental backup is a backup of all of the data that has changed since the last full database backup.
在星期六发生故障时，可以恢复上个星期日的全备份并应用从星期一到星期六的delta备份。
In the case of a failure on Saturday, you could restore the first Sunday full backup and apply the delta backups from Monday until Saturday. See the diagram below.
另一种机制通过使用全备份，并前滚事务日志，使数据库恢复到最近的状态，这种机制也叫前滚恢复。
The second restores to the most recent state, using a combination of full backup plus rolling forward the transaction log, called rollforward recovery.
delta备份是最近一次成功的备份(包括全备份、增量备份和delta备份)以来修改的备份。
A delta backup is a backup of changes since the last successful full, incremental, or delta backup.
（当前的StackOverflow的全备份压缩之后有7GB左右，而另一个数据库压缩后大概有2GB）。
The current Stack Overflow full backup is about 7 GB compressed, and the other databases are perhaps 2 GB compressed.
在发生故障时，例如在星期六进行增量备份之后发生了故障，那么只能恢复上个星期日的全备份并应用星期六的增量备份。
In the case of a failure, for example on Saturday after the incremental backup is taken, you can just restore the first Sunday full backup and apply the incremental on Saturday.
(某些数据库可能会更频繁，但这是通常的方式)这些数据库的全备份都存储在PEAK数据中心机架上的NASRAID - 6设备中。
(some databases are backed up more aggressively, but this is typical.) These full database backups are stored on our NAS RAID-6 device on the rack at the PEAK datacenter.
delta备份：delta备份是对最近一次成功的备份(包括全备份、增量备份和delta备份)以来被修改了的数据的备份。
Delta backup: delta backup is backup of only the data that has changed since the last successful full, incremental, or delta backup.
能够在全尺寸显示器上显示视频、文件和游戏，同时还可以使用外部备份存储，这些只是智能手机扩展坞的几点好处。
Being able to display video, documents and games on a full sized monitor while having additional backup storage are just a couple of benefits of the smartphone dock.
能够在全尺寸显示器上显示视频、文件和游戏，同时还可以使用外部备份存储，这些只是智能手机扩展坞的几点好处。
Being able to display video, documents and games on a full sized monitor while having additional backup storage are just a couple of benefits of the smartphone dock.
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