Dell PowerVault 775N (Rackmount NAS Appliance) - Manual (Page 54)

beyond the allocated space, you might lose previous versions of some files. Having a large NTFS file cluster size
decreases the growth of the difference file.
Storing Shadow Copies
The NAS system can store a maximum of 64 shadow copies per volume; however, if you exceed the maximum, the oldest
copy is overwritten. This number of copies allows you to schedule multiple shadow copies. (Create your schedule depending
on how the data is changing.)
Configuring Volume Settings
1. Log in to the NAS Manager.
2. Click Disks.
3. Click Shadow Copies.
4. Select the volume that you want to configure.
5. Click Properties.
6. Set the maximum size for shadow copies by either selecting No limit or selecting Use limit and entering the amount
of disk space that can be used for shadow copies.
7. Click OK.
Using Shadow Copies
In addition to scheduling shadow copies, you can make new copies on demand, delete existing copies, configure the shadow
copies environment, and set shadow copy retention weights.
Making a Shadow Copy on Demand
1. Log in to the NAS Manager.
2. Click Disks.
3. Click Shadow Copies.
4. Select the volume(s) of which you want to make a shadow copy.
5. In the Tasks list on the Manage Shadow Copies page, click New Shadow Copy.
The page refreshes and the number in the Copies column increases by 1.
Deleting a Shadow Copy
1. Log in to the NAS Manager.
2. Click Disks.
3. Click Shadow Copies.