ZyXEL NSA-2400 ユーザーガイド
Chapter 6 Protect Screens
NSA-2400 User’s Guide
84
"
Configuration File Backup and Restoration does not affect data (your files and
folders), volumes on the NSA.
folders), volumes on the NSA.
6.1.2 Genie Backup Manager
Use the Genie Backup Manager to transfer data from your computer to the NSA. You could
use Genie Backup Manager to back up from one NSA to another NSA but it’s recommended
you use the NSA Protect > Backup to do this (see
use Genie Backup Manager to back up from one NSA to another NSA but it’s recommended
you use the NSA Protect > Backup to do this (see
) as the latter
would be faster.
"
The Genie Backup program uses the same network port as the NDU to
discover the NSA. To avoid a port conflict, do not run the Genie Backup
Manager at the same time as the NDU.
discover the NSA. To avoid a port conflict, do not run the Genie Backup
Manager at the same time as the NDU.
6.1.3 Snapshots
A snapshot is a record of changes to a (internal) volume at a particular moment in time. As it
only records changes to files made in a volume, it’s faster and takes up less space than a
backup. Snapshots are good for data that changes often and needs to have high availability. If
files within a volume become infected or corrupted, you can revert the volume back to a
previous snapshot.
only records changes to files made in a volume, it’s faster and takes up less space than a
backup. Snapshots are good for data that changes often and needs to have high availability. If
files within a volume become infected or corrupted, you can revert the volume back to a
previous snapshot.
You can only create snapshots of a complete volume, not a single file or folder within a
volume. If a volume is restored to a previous snapshot, then all files in that snapshot are
returned to the state they were in at the time of the snapshot.
volume. If a volume is restored to a previous snapshot, then all files in that snapshot are
returned to the state they were in at the time of the snapshot.
When you roll back to a previous snapshot, all intermediate snapshots between the rollback
and the present are deleted. For example, say you had daily snapshots scheduled. Today is
Friday and you decide to roll back to Monday's snapshot. Then the snapshots from Tuesday,
Wednesday and Thursday are deleted after the rollback is completed.
and the present are deleted. For example, say you had daily snapshots scheduled. Today is
Friday and you decide to roll back to Monday's snapshot. Then the snapshots from Tuesday,
Wednesday and Thursday are deleted after the rollback is completed.
You can continue to work, while the snapshot is taken. It's a good idea to save your open files
first before taking a snapshot. Snapshots may get progressively slower as more are done but
they are still very fast compared to backups (as only block changes are recorded).
first before taking a snapshot. Snapshots may get progressively slower as more are done but
they are still very fast compared to backups (as only block changes are recorded).
6.1.3.1 Some Important Notes on Snapshots
1 Snapshots cannot be taken on external volumes or internal volumes using the BACKUP
storage system. Snapshots are stored in the reserved snapshot space.
2 If the reserved space for snapshots runs out, then all snapshots (including previously
created ones) are lost. Make sure that you reserve enough space for snapshots.
3 Since a snapshot is a record of changes, if very large files (typically over 1GB) are
transferred onto the volume, then that ‘change’ may be larger than the reserved space for
the snapshot causing it to become invalid.
the snapshot causing it to become invalid.